Библиотека института физики им. Л.В. Киренского СО РАН

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Найдено в других БД:

Каталог книг и брошюр библиотеки ИФ СО РАН (18)

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=time<.>)

Общее количество найденных документов : 84
Показаны документы с 1 по 20

1-20 21-40 41-60 61-80 81-84

Dynamic phosphorescence/fluorescence switching in hybrid metal halides toward time-resolved multi-level anti-counterfeiting / G. Zhou, Y. Mao, J. Zhang [et al.] // Adv. Funct. Mater. - 2025. - Vol. 35, Is. 3. - Ст. 2413524, DOI 10.1002/adfm.202413524. - Cited References: 27. - G.Z. and Y.M. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (52202177; 22361132525), Natural Science Foundation of Shanxi Province (20210302124054), Shanxi-Zheda Institute for New Material and Chemical Engineering (2022SX-RF003), and the Ministry of Science and High Education of Russian Federation (FSRZ-2023-0006) . - ISSN 1616-301X. - ISSN 1616-3028
Кл.слова (ненормированные):
hybrid metal halides -- multi-level anti-counterfeiting -- room-temperature phosphorescence -- self-trapped exciton
Аннотация: Hybrid metal halides (HMHs) with time-resolved luminescence behavior promise to be a breakthrough in multi-level anti-counterfeiting, but controlling the dynamic switching between phosphorescence and fluorescence is extremely challenging. Herein, an array of 0D HMHs is constructed by screening the π-conjugated ligand with room-temperature phosphorescence (RTP). Compared to the organic chromophore, (ETPP)2ZrCl6 possesses a misaligned stacking and rigid structure, contributing to an improved phosphorescence quantum yield (ΦP = 27.50%) and an extended phosphorescence lifetime (τ = 0.6234 s), as the intervening of inorganic unit [ZrCl6]2− suppresses the energy losses caused by nonradiative relaxation and prompts the intersystem crossover (ISC) process. Not only that, the interplay of phosphorescence-fluorescence dual-mode emission can be intelligently controlled by doping the active metal Te4+, resulting in a dynamic switching between RTP phosphorescence and self-trapped exciton (STE) fluorescence. DFT calculations reveal the governing origins of RTP-STE from the intermolecular ISC channels and spin-orbit coupling (SOC) coefficients. These precise images into periodic pixelated arrays enable the multi-level anti-counterfeiting and information encryption. This work proposes a fluorescence-phosphorescence co-modulating strategy under the premise of dissecting the structural origins for optimizing RTP phosphorescence, which paves the way for designing high-security-level anti-counterfeiting materials.

Смотреть статью,
Scopus
Держатели документа:
Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China
College of Chemistry & Chemical Engineering, Key Laboratory of Interface Science and Engineering in Advanced Material, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Physics and Technical Sciences, Western Caspian University, Baku, AZ 1001, Azerbaijan
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, P. R. China

Доп.точки доступа:
Zhou, G.; Mao, Y.; Zhang, J.; Ren, Q.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zh.; Zhang, X.-M.
}
Найти похожие

Kovaleva, E. A.
Time-dependent DFT-based study of bacteriochlorophyll a optical properties within the B800 part of LH2 Rhodoblastus acidophilus light-harvesting complex / E. A. Kovaleva, L. V. Begunovich, M. M. Korshunov // J. Photochem. Photobiol. A: Chem. - 2025. - Vol. 468. - Ст. 116489, DOI 10.1016/j.jphotochem.2025.116489. - Cited References: 41. - We thank V.F. Shabanov for useful discussions. This work was supported by the state assignment of the Ministry of Science and Higher Education of the Russian Federation. Authors would like to thank Information Technology Centre, Novosibirsk State University for providing access to their supercomputers. L.V.B. would like to thank Irkutsk Supercomputer Center of SB RAS for providing the access to HPC-cluster «Akademik V.M. Matrosov» (Irkutsk Supercomputer Center of SB RAS, Irkutsk: ISDCT SB RAS; http://hpc.icc.ru) . - ISSN 1010-6030. - ISSN 1873-2666
Кл.слова (ненормированные):
Light-harvesting complex -- Purple bacteria -- DFT -- DFTB -- TD-DFT -- Optical absorption spectra
Аннотация: Optical absorption of B800 part of Rhodoblastus acidophilus light-harvesting complex 2 (LH2) and its constituent bacteriochlorophyll a molecule was studied using time-dependent density functional theory-based approaches. We proved the absence of any sizable effects originating from the interaction between adjacent molecules, thus optical features of B800 LH2 part should not be attributed to the structural organization of pigments. In addition, time-dependent procedure itself was found to be crucial for the correct description of bacteriochlorophyll a absorption spectrum.

Смотреть статью,
WOS
Держатели документа:
Federal Research Center Krasnoyarsk Science Center SB RAS, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Begunovich, L. V.; Korshunov, M. M.; Коршунов, Максим Михайлович
}
Найти похожие

    Study of the dependence of hydroxyl groups numbers on treatment time during the synthesis of fullerenols / N. G. Vnukova, V. G. Isakova, V. I. Еlesina [et al.] // Fuller. Nanotub. Carbon Nanostructures. - 2025, DOI 10.1080/1536383X.2025.2485241. - Cited References: 41 . - Article in press. - ISSN 1536-383X. - ISSN 1536-4046
   Перевод заглавия: Изучение зависимости количества гидроксильных групп от времени обработки при синтезе фуллеренола
Кл.слова (ненормированные):
Water-soluble derivatives of fullerene -- fullerene derivatives -- fullerenol -- hydroxyl group -- C60Ox(OH)y
Аннотация: Our present study aims to obtain and examine the fullerenols (water-soluble derivatives of fullerenes) with various amounts of hydroxyl groups. The work presents the results of obtaining fullerenols by boiling in nitric acid with subsequent hydrolysis of polynitro intermediates with water at different treatment durations. The obtained samples were certified by X-ray photoelectron and IR spectroscopy methods and it was found that 10-h treatment allowed obtaining fullerenol with the composition C60Ox(OH)y, where x + y = 12−14, 15-h treatment yielded C60Ox(OH)y, where x + y = 16−18, and 20-h boiling in acid yielded C60Ox(OH)y, where x + y = 24−26. The reproducibility of the obtained results allowed the addition of a predictable number of functional groups.

Смотреть статью,
WOS
Держатели документа:
Kirensky Institute of Physics, FSBSI "Federal Research Center Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, FSBSI "Federal Research Center Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia

Доп.точки доступа:
Vnukova, N. G.; Внукова, Наталья Григорьевна; Isakova, V. G.; Исакова, Виктория Гавриловна; Elesina, V. I.; Елесина, Виктория Игоревна; Tomashevich, Ye. V.; Томашевич, Евгений Владимирович; Churilov, G. N.; Чурилов, Григорий Николаевич
}
Найти похожие

Synergetic experimental and theoretical investigation of molecular structure – Optical properties relationships of anthrazoline-based polymeric chains / I. A. Shchugoreva, R. Y. Smyslov, I. A. Nasirova [et al.] // Opt. Mater. - 2024. - Vol. 157, Part 1. - Ст. 116135, DOI 10.1016/j.optmat.2024.116135. - Cited References: 34. - Felix N. Tomilin and Sergei G. Ovchinikov within the state assignment of Kirensky Institute of Physics, Irina A. Shchugoreva, Polina V. Artyushenko, and Anastasia V. Rogova appreciates the Ministry of Science and Higher Education of the Russian Federation for funding the study, project no. FWES-2022-0005. Molecular design of anthrazoline derivatives was supported by the National Research Foundation of the Republic of Korea, grant NRF 2021R1A2C1010455. - The authors thank the Joint Supercomputer Center of the Russian Academy of Sciences (JCSS of RAS) for providing computer simulations . - ISSN 0925-3467. - ISSN 1873-1252
Кл.слова (ненормированные):
Polyamides -- Electronic structure -- Induction effect -- Mesomeric effect -- Time-depending density functional theory TD-DFT -- B3LYP
Аннотация: The photoluminescence and UV–Vis absorption spectra of copolyamides containing 1,9-anthrazoline with para- and meta-[(substituted carbonyl)amino]phenyl-1-ene moieties in a polymer backbone were studied by a combination of experimental and theoretical approaches. The investigation was accomplished through time-dependent density functional theory electronic structure calculations of small-molecule models mimicking a polymer chain. Theoretical absorption and luminescence spectra of ten atomistic models were compared with corresponding experimental data, and the optical properties of two new luminescent molecules with bromine auxochrome were predicted. An analysis of the optical properties demonstrate an identical effect of the type and position of a substituent on the spectra for para- and meta-[(substituted carbonyl)amino]phenyl-1-ene moieties. It was found that the absorption and luminescence spectra of theoretical para-models demonstrate red shifts relative to the corresponding meta-ones. The same phenomenon was observed in experimental spectra of low-molecular-mass compounds and corresponding copolyamides in solution and bulk. Unique optical properties allow anthrazoline-based polymer compounds to be used in numerous advanced optoelectronic applications with desired optical and electronic characteristics.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Laboratory for Digital Controlled Drugs and Theranostics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, 660036, Russia
Krasnoyarsk State Medical University, ul. Partizana Zheleznyaka 1, Krasnoyarsk, 660022, Russia
Branch of Petersburg Nuclear Physics Institute named by B.P.Konstantinov of National Research Centre «Kurchatov Institute» – Institute of Macromolecular Compounds, Bolshoy pr-t 31, St. Petersburg, 199004, Russia
Institute of Biomedical Systems and Biotechnology, Graduate School of Biomedical Systems and Technology, Peter the Great St. Petersburg Polytechnic University, St. Petersburg, 195251, Russia
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Akademgorodok 50, Krasnoyarsk, 660036, Russia
Department of Chemistry and Green-Nano Materials, Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41556, Republic of Korea

Доп.точки доступа:
Shchugoreva, I. A.; Smyslov, R. Y.; Nasirova, I. A.; Goikhman, M. Y.; Yakimansky, A. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Artyushenko, P. V.; Rogova, A. V.; Tomilin, F. N.; Томилин, Феликс Николаевич; Avramov, P. V.
}
Найти похожие

    Лукин, Юрий Иванович.
    Функция распределения времен диэлектрических релаксаций в минеральной среднеглинистой почве / Ю. И. Лукин, А. Ю. Каравайский // Журн. радиоэлектрон. - 2024. - № 11. - Ст. 9 ; J. Radio Electron., DOI 10.30898/1684-1719.2024.11.18. - Библиогр.: 27 . - ISSN 1684-1719
   Перевод заглавия: The relaxation time distribution function for a mineral medium clay soil
Кл.слова (ненормированные):
диэлектрическая проницаемость -- минеральная почва -- спектроскопия -- функция распределения времен релаксации -- permittivity -- mineral soil -- spectroscopy -- relaxation time distribution function
Аннотация: Измерены спектры комплексной диэлектрической проницаемости образцов минеральной среднеглинистой почвы из Краснодарского края, Российской Федерации, с различной влажностью при температуре 20℃, в частотном диапазоне электромагнитных волн от 15 МГц до 50 ГГц. Проведен анализ диэлектрических релаксаций в исследуемой влажной почве с помощью метода восстановления функции распределения времен релаксаций из измеренных спектров комплексной диэлектрической проницаемости. Обнаружено, что для влажной минеральной почвы функция распределения времен релаксаций является дискретной с четырьмя релаксациями. Исследованы времена и относительный вклад диэлектрических релаксаций в спектр комплексной диэлектрической проницаемости минеральной почвы в зависимости от влажности в рассматриваемом частотном диапазоне.
The complex permittivity spectra of mineral medium-clay soil samples from The Krasnodar Territory, Russian Federation, with different moisture content at a temperature of 20℃, were measured in the frequency range of electromagnetic waves from 15 MHz to 50 GHz. An analysis of dielectric relaxations in the studied wet soil was carried out using the method of retrieving the relaxation time distribution function from the measured complex dielectric permittivity spectra. The relaxation time distribution function for the wet mineral soil was found to be discrete with four relaxations. The times and relative contributions of dielectric relaxations to the spectrum of complex permittivity of the mineral soil depending on moisture content were investigated in the frequency range under consideration.

Смотреть статью,
РИНЦ
Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук – обособленное подразделение ФИЦ КНЦ СО РАН 660036, Красноярск, ул. Академгородок 50, стр.38

Доп.точки доступа:
Каравайский, Андрей Юрьевич; Karavaisky, A. Yu.; Lukin, Y. I.

}
Найти похожие

    Luminescent studies of flexible [DUT-8 (Zn)] metal-organic frameworks / N. V. Slyusarenko, A. S. Krylov, M. V. Timofeeva [et al.] // Proc. SPIE. - 2023. - Vol. 12920: XVI International Conference on Pulsed Lasers and Laser Applications (10-15 September 2023, Tomsk, Russian Federation). - Ст. 1292014, DOI 10.1117/12.3005774. - Cited References: 10. - The reported study was funded by RFBR and DFG, project 21-52-12018
   Перевод заглавия: Изучение люминесценции гибкого DUT-8 (Zn) металлоорганического каркасного соединения
Кл.слова (ненормированные):
Förster resonance energy transfer -- FRET -- DUT-8 (Zn) -- metal-organic frameworks -- dye -- energy transfer -- efficiency -- steady-state luminescence -- time-resolved luminescence
Аннотация: An approach to the study of the porous structure of metal-organic frameworks (MOF) using guest luminescent molecules with specially selected spectral characteristics as acceptors of electronic excitation energy was suggested. If such molecules are adsorbed in MOF pores with sizes comparable to the Förster radius, Förster resonance energy transfer (FRET) from photoexcited linkers occurs. In this case quenching of luminescence of the linker can serve as analytical signals indicating open pore structure of the MOF. The developed approach was demonstrated by the example of DUT-8(Zn) MOF and Coumarin 1 as guest molecules by time-resolved luminescence methods.

Смотреть статью,
Scopus
Держатели документа:
Siberian Federal University, Svobodny Prospect 79, 660041, Krasnoyarsk, Russia
Kirensky Institute of Physics FRC KSC SB RAS, Academgorodok 50/38, 660036, Krasnoyarsk, Russia
ITMO University, School of Physics and Engineering, Kronverksky Prospekt 49, bldg. A, 197101, St. Petersburg, Russia

Доп.точки доступа:
Slyusarenko, N. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Timofeeva, M. V.; Shipilovskikh, S. A.; Slyusareva, E. A.; International Conference on Pulsed Lasers and Laser Applications(16 ; 2023 : 10-15 Sept. ; Tomsk, Russian Federation)
}
Найти похожие

Ferrihydrite nanoparticles produced by Klebsiella oxytoca: Structure and properties dependence on the cultivation time / S. V. Stolyar, O. A. Bayukov, D. A. Balaev [et al.] // Adv. Powder Technol. - 2022. - Vol. 33, Is. 8. - Ст. 103692, DOI 10.1016/j.apt.2022.103692. - Cited References: 59. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects No. 20-416-242907 . - ISSN 0921-8831
Кл.слова (ненормированные):
Ferrihydrite nanoparticles -- Structure -- Microbial synthesis -- Mössbauer spectroscopy -- Small-angle X-ray scattering
Аннотация: Ferrihydrite nanoparticles were synthesized using Klebsiella oxytoca microorganisms under various cultivation conditions. The cultivation of bacteria was carried out under various lighting conditions, and the duration of cultivation varied from 3 to 56 days. Biogenic ferrihydrite nanoparticles were studied by Mössbauer spectroscopy, magnetometry, and small-angle X-ray scattering. The process of formation of ferrihydrite nanoparticles and the states arising during the cultivation of microorganisms have been investigated. The results of Mössbauer spectroscopy showed that, depending on the time of cultivation, three different states of ferrihydrite can be realized. States differ both in the ratio of defective and non-defective positions, and the size of the particle. Experimental results indicate that ferrihydrite nanoparticles are a system of variable composition and pass through several structural (or morphological) states during the cultivation of microorganisms. A model of the structure of ferrihydrite nanoparticles is proposed, which consists in the presence of an antiferromagnetic dense core with a high Néel temperature and a friable shell with a significantly lower temperature of magnetic ordering.

Смотреть статью,
Scopus
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Joint Institute for Nuclear Research, Dubna, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Ladygina, V. P.; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Balasoiu, M.; Kolenchukova, O. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
Найти похожие

Unusual shift in the visible absorption spectrum of an active ctenophore photoprotein elucidated by time-dependent density functional theory / F. N. Tomilin, A. V. Rogova, L. P. Burakova [et al.] // Photochem. Photobiol. Sci. - 2021. - Vol. 20, Is. 4. - P. 559-570, DOI 10.1007/s43630-021-00039-5. - Cited References: 61. - The ab initio quantum chemical calculations were funded by RFBR and NSFC as the research project No. 19-54-53004 and RFBR research project No. 20-04-00085. The development of structural atomistic model of berovin without calcium ions generated by the I-TASSER server was funded by project 0721-2020-0033 of the Russian Ministry of Science and Education . - ISSN 1474-905X. - ISSN 1474-9092

РУБ Biochemistry & Molecular Biology + Biophysics + Chemistry, Physical

Аннотация: Active hydromedusan and ctenophore Ca2+-regulated photoproteins form complexes consisting of apoprotein and strongly non-covalently bound 2-hydroperoxycoelenterazine (an oxygenated intermediate of coelenterazine). Whereas the absorption maximum of hydromedusan photoproteins is at 460–470 nm, ctenophore photoproteins absorb at 437 nm. Finding out a physical reason for this blue shift is the main objective of this work, and, to achieve it, the whole structure of the protein–substrate complex was optimized using a linear scaling quantum–mechanical method. Electronic excitations pertinent to the spectra of the 2-hydroperoxy adduct of coelenterazine were simulated with time-dependent density functional theory. The dihedral angle of 60° of the 6-(p-hydroxy)-phenyl group relative to the imidazopyrazinone core of 2-hydroperoxycoelenterazine molecule was found to be the key factor determining the absorption of ctenophore photoproteins at 437 nm. The residues relevant to binding of the substrate and its adopting the particular rotation were also identified.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Fed Res Ctr Krasnoyarsk Sci Ctr SB RAS, Kirensky Inst Phys SB RAS, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Svobodny 79 Pr, Krasnoyarsk 660041, Russia.
Natl Res Tomsk State Univ, Lenin Ave 36, Tomsk 634050, Russia.
Fed Res Ctr Krasnoyarsk Sci Ctr SB RAS, Photobiol Lab, Inst Biophys SB RAS, Akademgorodok 50-50, Krasnoyarsk 660036, Russia.
Kyungpook Natl Univ, 80 Daehakro, Daegu 41566, South Korea.
Natl Inst Adv Ind Sci & Technol, Res Ctr Computat Design Adv Funct Mat CD FMat, Cent 2,Umezono 1-1-1, Tsukuba, Ibaraki 3058568, Japan.

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Rogova, A. V.; Burakova, L. P.; Tchaikovskaya, O. N.; Avramov, P. V.; Fedorov, D. G.; Vysotski, E. S.; RFBRRussian Foundation for Basic Research (RFBR) [20-04-00085]; NSFCNational Natural Science Foundation of China (NSFC) [19-54-53004]; Russian Ministry of Science and EducationMinistry of Education and Science, Russian Federation [0721-2020-0033]
}
Найти похожие

Charge transfer plasmons in the arrays of nanoparticles connected by conductive linkers / A. S. Fedorov, M. A. Visotin, V. S. Gerasimov [et al.] // J. Chem. Phys. - 2021. - Vol. 154, Is. 8. - Ст. 012009, DOI 10.1063/5.0040128. - Cited References: 41. - This study was supported by the Russian Science Foundation, Project No. 18-13-00363 . - ISSN 0021-9606
Кл.слова (ненормированные):
Analytical expressions -- Carrier scattering -- Charge displacement -- External electromagnetic field -- Finite difference time domain simulations -- Metallic nanoparticles -- Numerical solution -- Plasmon oscillations
Аннотация: Charge transfer plasmons (CTPs) that occur in different topology and dimensionality arrays of metallic nanoparticles (NPs) linked by narrow molecular bridges are studied. The occurrence of CTPs in such arrays is related to the ballistic motion of electrons in thin linkers with the conductivity that is purely imaginary, in contrast to the case of conventional CTPs, where metallic NPs are linked by thick bridges with the real optical conductivity caused by carrier scattering. An original hybrid model for describing the CTPs with such linkers has been further developed. For different NP arrays, either a general analytical expression or a numerical solution has been obtained for the CTP frequencies. It has been shown that the CTP frequencies lie in the IR spectral range and depend on both the linker conductivity and the system geometry. It is found that the electron currents of plasmon oscillations correspond to minor charge displacements of only few electrons. It has been established that the interaction of the CTPs with an external electromagnetic field strongly depends on the symmetry of the electron currents in the linkers, which, in turn, are fully governed by the symmetry of the investigated system. The extended model and the analytical expressions for the CTPs frequencies have been compared with the conventional finite difference time domain simulations. It is argued that applications of this novel type of plasmon may have wide ramifications in the area of chemical sensing.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
International Research Center of Spectroscopy and Quantum Chemistry - IRC SQC, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
National Research Tomsk State University, Tomsk, 634050, Russian Federation
Institute of Computational Modelling, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Federal Siberian Research Clinical Centre, FMBA of Russia, Krasnoyarsk, 660037, Russian Federation
Kyungpook National University, Daegu, 41566, South Korea

Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Visotin, M. A.; Высотин, Максим Александрович; Gerasimov, V. S.; Polyutov, S. P.; Avramov, P. A.
}
Найти похожие

10.

Quantum chemical study of the spectral characteristics of fluorescein dyes bound to chitosan / A. V. Rogova, M. A. Gerasimova, F. N. Tomilin, E. A. Slyusareva // Proc. SPIE : SPIE, 2021. - Vol. 12086: 15th International Conference on Pulsed Lasers and Laser Applications (12 - 17 September 2021, Tomsk, Russia) Conference code: 176103. - Ст. 120861V, DOI 10.1117/12.2613980. - Cited References: 17. - This study was supported by the Russian Foundation for Basic Research, project no. 19-02-00450-а and by the Ministry of Science and High Education of Russian Federation, project no. FSRZ-2020-0008
Кл.слова (ненормированные):
chitosan -- density functional theory -- eosin Y -- erythrosin B -- fluorescein -- polarizable continuum model -- time-dependent procedure
Аннотация: Recently, there has been an increased interest in natural polysaccharides, in particular, chitosan, which are widely used in medicine and industry. Chitosan labeled with fluorescein dyes acquires additional optical properties that can be used in sensing and delivery systems. Mechanism of binding of a polymer to a label largely determines the field of its possible applications. The quantum chemical calculation using the B3LYP/aug-cc-pVDZ theory level has been made in order to contribute to the understanding of intermolecular interactions. The geometry of fluorescein, eosin Y, and erythrosin B in the dianionic, monoanionic, and neutral quinoid forms interacting with chitosan has been optimized and the absorption spectra have been calculated using the time-dependent density functional theory taking into account the solvent. The comparison of the calculated absorption spectra with the experimental data has shown a major role of the electrostatic mechanism in binding of anionic dyes to the protonated chitosan groups.

Смотреть статью,
Scopus
Держатели документа:
Siberian Federal University, Svobodny 79, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Rogova, A. V.; Gerasimova, M. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Slyusareva, E. A.; International Conference on Pulsed Lasers and Laser Applications(15 ; 2021 ; Sept. ; Tomsk, Russia)
}
Найти похожие

11.

Dynamics of resonant x-ray and Auger scattering / F. Gel'mukhanov, M. Odelius, S. P. Polyutov [et al.] // Rev. Mod. Phys. - 2021. - Vol. 93, Is. 3. - Ст. 035001, DOI 10.1103/RevModPhys.93.035001. - Cited References: 467. - The reported study was funded by the Russian Foundation for Basic Research (RFBR) (Project No. 19-29-12015) and partly supported by the Ministry of Science and Higher Education of the Russian Federation (Project No. FSRZ-2020-0008). M. O. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under Marie Skłodowska-Curie Grant Agreement No. 860553, the Carl Tryggers Foundation (Contract No. CTS18:285), and the Swedish Energy Agency (Contract No. 2017-006797). Funding is acknowledged from the European Research Council through ERC-ADG-2014 (Advanced Investigator Grant No. 669531 EDAX) at the University of Potsdam within the Horizon 2020 EU Framework Programme for Research and Innovation. Support from the Helmholtz Association, in particular, the Helmholtz Virtual Institute 419 “Dynamic Pathways in Multidimensional Landscapes” and the Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, is acknowledged. Support from the Swedish Research Council (Grants No. 2019-03470 and No. 2015-03781) is also acknowledged . - ISSN 0034-6861
Кл.слова (ненормированные):
Augers -- Electrons -- Free electron lasers -- Light absorption -- Neutron scattering -- X ray scattering -- X rays -- Electron-nuclear dynamics -- Experimental techniques -- Resonant inelastic x-ray scattering -- Resonant scattering -- Structural aspects -- Time resolved studies -- Vibrational infrared -- X-ray free electron lasers
Аннотация: An overview of both experimental and theoretical results in the field of resonant scattering of tunable soft and hard x-ray radiation is presented, with a main focus on the closely related processes of resonant inelastic x-ray scattering (RIXS) and resonant Auger scattering (RAS). The review starts with an overview of fundamental dynamical aspects of RIXS illustrated for different systems. A detailed analysis of case studies with increasing complexity, considering both gas-phase and condensed matter (liquids and solids) applications, is given. In the review, the most important achievements in investigations of coupled electron-nuclear dynamics and structural aspects in studies of liquids and solids over the last two decades are outlined. To give a perspective on the insights from RIXS and RAS, the x-ray results are discussed against the background of complementary experimental techniques like vibrational infrared absorption and Raman spectroscopy, as well as small-angle x-ray and neutron scattering. Finally, recent achievements in time-resolved studies based on x-ray free-electron lasers are described.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, Stockholm, 10691, Sweden
Institute for Methods and Instrumentation in Synchrotron Radiation Research, Helmholtz-Zentrum Berlin fur Materialien und Energie, Albert-Einstein-Strasse 15, Berlin, 12489, Germany
International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, AlbaNova University Center, Stockholm University, Stockholm, SE-106 91, Sweden
Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Potsdam, 14476, Germany

Доп.точки доступа:
Gel'mukhanov, F.; Гельмуханов, Фарис Хафизович; Odelius, M.; Polyutov, S. P.; Полютов, Сергей Петрович; Fohlisch, A.; Kimberg, V.; Кимберг, Виктор Валерьевич
}
Найти похожие

12.

Electron-rotation coupling in diatomics under strong-field excitation / Y. R. Liu, Y. Wu, J. G. Wang [et al.] // Phys. Rev. A. - 2020. - Vol. 102, Is. 3. - Ст. 033114, DOI 10.1103/PhysRevA.102.033114. - Cited References: 78. - S.B.Z. thanks H. D. Meyer for his helpful instructions of Wigner-DVR in MCTDH. Grants from the National Basic Research Program of China (2017YFA0403200), NSFC (No. 11604197, No. 11974230, and No. 11934004), the Science Challenge Program of China (TZ2018005 and TZ2016005) are acknowledged. V.K. acknowledges financial support from Swedish Research Council (VR) and the Ministry of Science and High Education of Russian Federation, Project No. FSRZ2020-0008. . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
REAL-TIME OBSERVATION
   DYNAMICS
   LASER
   ULTRAFAST
   MOLECULES
Аннотация: he photoexcitation and photodissociation of diatomic molecules by intense pulse lasers has been the subject of extensive investigations over the past decades. However, the usually employed theoretical framework neglects the coupling between the molecular rotational angular momentum (R) and the angular momentum of the electrons projected onto the molecular axis Ω=Λ+Σ, which results in the known Λ-doubling phenomenon in high-resolution electronic spectra of diatomic molecules. While neglecting this coupling is an excellent approximation in the weak-field or perturbative regime owing to the large mass difference between the rotating atoms and the electrons, the approximation breaks down for intense laser pulses because of the repeated Rabi cycling of the electronic transitions, which can have a significant effect on the rotational degrees of freedom of the molecule. By correcting the transition dipole matrix elements and introducing angular basis sets based on Wigner D functions, the conventional theoretical treatment is generalized to a universal description valid for both the weak- and strong-field regimes. The theoretical treatment developed here is applied to the ∣1Σ› to ∣1Π› transitions in diatomic systems. Our results reveal that, for field intensities resulting in about one Rabi cycling for extreme ultraviolet or x-ray transitions, the theoretical predictions by the conventional theoretical frame need to be corrected when considering observables such as the molecular alignment and the angular distribution of the photofragments.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710119, Peoples R China.
Inst Appl Phys & Computat Math, POB 8009, Beijing 100088, Peoples R China.
Peking Univ, Ctr Appl Phys & Technol, Beijing 100084, Peoples R China.
Heidelberg Univ, Phys Chem Inst, Theoret Chem, Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
Royal Inst Technol, Theoret Chem & Biol, S-10691 Stockholm, Sweden.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Liu, Yan Rong; Wu, Yong; Wang, Jian Guo; Vendrell, Oriol; Kimberg, V.; Кимберг, Виктор Валерьевич; Zhang, Song Bin
}
Найти похожие

13.

X-ray transient absorption spectroscopy by an ultrashort x-ray-laser pulse in a continuous-wave IR field / X. Shi, Y. Wu, J. G. Wang [et al.] // Phys. Rev. A. - 2020. - Vol. 101, Is. 2. - Ст. 023401, DOI 10.1103/PhysRevA.101.023401. - Cited References: 56. - Grants from the National Basic Research Program of China (Grant No. 2017YFA0403200), National Natural Science Foundation of China (Grants No. 11604197, No. 11934004, and No. 11974230), the Science Challenge Program of China (Grants No. TZ2018005 and No. TZ2016005), and the Organization Department of CCCPC are acknowledged. V.K. acknowledges financial support from Swedish Research Council within the State Contract of the Ministry of Education and Science of the Russian Federation for Siberian Federal University for Scientific Research in 2017-2019 (Project No. 3.2662.2017) . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
MOLECULAR NITROGEN
   TIME
   DYNAMICS
   PHASE
   SPECTRA
   DECAY
Аннотация: X-ray transient absorption spectra (XTAS) of molecules are theoretically investigated in a femtosecond x-ray pump and continuous-wave (cw) infrared (IR)-control scenario. The scheme is exemplified by a CO molecule resonantly pumped into carbon and oxygen core-excited 1s→π∗ states by a weak femtosecond x-ray pulse, while dynamic Stark shifts are induced by the cw IR-control radiation. As a result, significant shoulder structures appear in XTAS showing strong dependence on the phase of IR radiation relative to the envelope of the x-ray pulse. Due to a significant difference in the frequencies of the two pulses, the present XTAS scheme provides much clear interpretation of the dynamic Stark effects as compared to the attosecond UV transient absorption scenario. Within the suggested two-level model, where the total spectrum is decomposed as incoherent superposition of contributions from different vibrational excitations weighted by the Franck-Condon Factors, all spectral structures can be well identified and interpreted in a good agreement with the full-scale molecular simulations. Well-characterized XTAS in the proposed IR-control scheme can be applied for fine phase synchronization between IR and x-ray pulses, highly demanded in modern experiments on x-ray free-electron lasers.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710119, Peoples R China.
Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China.
Peking Univ, Ctr Appl Phys & Technol, Beijing 100084, Peoples R China.
Royal Inst Technol, Theoret Chem & Biol, S-10691 Stockholm, Sweden.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Shi, Xin; Wu, Yong; Wang, Jian Guo; Kimberg, V.; Кимберг, Виктор Валерьевич; Zhang, Song Bin
}
Найти похожие

14.

Aplesnin, S. S.
Magnetic capacitance in variable-valence manganese sulfides / S. S. Aplesnin, A. M. Kharkov, G. Y. Filipson // Phys. Status Solidi B. - 2020. - Vol. 257, Is. 5. - Ст. 1900637, DOI 10.1002/pssb.201900637. - Cited References: 12. - This study was supported by the Russian Foundation for Basic Research No. 18-32-00079 mol_a. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science No. 18-42-240001 r_a . - ISSN 0370-1972
Кл.слова (ненормированные):
Debye model -- infrared spectroscopy -- magnetocapacitance -- permittivity -- relaxation time
Аннотация: The permittivity of TmxMn1–xS (0 < x < 0.15) solid solutions is measured in the frequency range of 102–106 Hz at temperatures of 300–500 K in magnetic fields of up to 12 kOe. The migration and relaxation conductivity contributions to the electric polarization are established. The relaxation time and activation energy are calculated using the Debye model. A decrease in the capacitance and relaxation time in a magnetic field is observed. The electron polarization relaxation channel provided by recombination of the electron–hole pairs is found using the infrared spectroscopy investigations.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50 bld. 38, Krasnoyarsk, 660036, Russian Federation
Institute of Space Technology, Reshetnev Siberian State University of Science and Technology, Krasnoyarskiy rabochiy Ave., 31, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Kharkov, A. M.; Filipson, G. Y.; Аплеснин, Сергей Степанович
}
Найти похожие

15.

Collective resonances in hybrid photonic-plasmonic nanostructures / A. E. Ershov, R. G. Bikbaev, I. L. Rasskazov [et al.] // J. Phys.: Conf. Ser. - 2020. - Vol. 1461, Is. 1. - Ст. 012046DOI 10.1088/1742-6596/1461/1/012046. - Cited References: 11. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (Grant No. 18-42-240013); A.E. thanks the grant of the President of Russian Federation (agreement 075-15-2019-676)
Кл.слова (ненормированные):
Hybrid systems -- Plasmonics -- Time domain analysis -- 1-D photonic crystal -- Defect layers -- Nanodisks -- Periodic arrays -- Plasmonic nanostructures -- Rayleigh anomalies -- Spectral position -- Theoretical modeling -- Finite difference time domain method
Аннотация: We present the theoretical model to predict the spectral position of Rayleigh anomalies emerged in hybrid system consisting of periodic array of plasmonic nanodisks embeded into the middle of defect layer of 1D photonic crystal (PhC). The spectral positions of these new emerged Rayleigh anomalies agree well with the results of exact simulations with Finite-Difference Time-Domain (FDTD) method.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Institute of Computational Modeling SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, 660014, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Optics, University of Rochester, Rochester, NY 14627, United States

Доп.точки доступа:
Ershov, A. E.; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Rasskazov, I. L.; Gerasimov, V. S.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Polyutov, S. P.; Karpov, S. V.; Карпов, Сергей Васильевич; International Conference on Metamaterials and Nanophotonics(4 ; 2019; July 15-19 ; St. Petersburg, Russian Federation)
}
Найти похожие

16.

Solvent effect in the theoretical absorption and emission spectra of fluorescein dyes / F. N. Tomilin, A. V. Rogova, E. V. Kaufman [et al.] // Proceedings of SPIE - The International Society for Optical Engineering. - 2019. - Vol. 11322: XIV International Conference on Pulsed Lasers and Laser Applications, AMPL 2019 (15-20 September 2019) Conference code: 156656. - Ст. 113220O, DOI 10.1117/12.2548739. - Cited References: 13. - This work was supported by the Russian Foundation for Basic Research, project 19-02-00450
Кл.слова (ненормированные):
fluorescein -- eosin Y -- erythrosin B -- dianion -- PCM -- time-dependent density functional theory
Аннотация: Fluorescein and its halogenated derivatives representing a family of homologous dyes with the gradual substitution of halogen atoms for hydrogen ones are widely used in biomedicine as fluorescent probes. This stimulates the intense experimental and theoretical studies of their fluorescent properties in aqueous solutions. However, the theoretical calculations are complicated by the necessity of taking into account the effect of a solvent (water) in the explicit form and the need for effective basic sets. This is especially important for the dyes that contain heavy atoms. In this study, the quantum-chemical investigations of the dianionic form of fluorescein and its Br- and I-substituted derivatives (eosin Y and erythrosin B) have been carried out using the time-dependent density functional theory (B3LYP functional) implemented in the GAMESS software suite. The effect of a solvent has been considered in the framework of the modified Thomas polarizable continuum model. The calculations have been made for vertical (absorption and emission) excitations in the adiabatic approximation and at the nonequilibrium solvation. The results obtained for the nonequilibrium solvation are in excellent agreement with the experimental data for fluorescein and its halogenated derivatives.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Rogova, A. V.; Kaufman, E. V.; Drevolsky, A. S.; Gerasimova, M. A.; Slyusareva, E. A.; International Conference on Pulsed Lasers and Laser Applications(14 ; 2019 ; 15-20 Sept. ; Tomsk)
}
Найти похожие

17.

    Zobov, V. E.
    On the effect of an inhomogeneous magnetic field on high-frequency asymptotic behaviors of correlation functions of spin lattices / V. E. Zobov, M. M. Kucherov // JETP Letters. - 2018. - Vol. 107, Is. 9. - P. 553-557, DOI 10.1134/S002136401809014X. - Cited References: 39 . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
HEISENBERG PARAMAGNET
   SYSTEMS
   TIME
   RELAXATION
   DYNAMICS
   SPECTRA
Аннотация: Singular points of spin autocorrelation functions on the imaginary time axis, which determine the arguments of exponential high-frequency asymptotic behaviors, have been analyzed. It has been shown that randomly distributed inhomogeneous magnetic fields expand the wings of spectra of autocorrelation functions and, thereby, intensify the heating of a system subjected to variable magnetic fields, which are used to create effective Hamiltonians or at the saturation of inhomogeneously broadened EPR lines.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ

Публикация на русском языке Зобов, Владимир Евгеньевич. О влиянии неоднородного магнитного поля на высокочастотные асимптотики корреляционных функций спиновых решеток [Текст] / В. Е. Зобов, М. М. Кучеров // Письма в Журн. эксперим. и теор. физ. - 2018. - Т. 107 Вып. 9-10. - С. 578-582

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Space & Informat Technol, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Kucherov, M. M.; Зобов, Владимир Евгеньевич
}
Найти похожие

18.

    Lundin, A. A.
    Asymptotic similarity of time correlation functions and shape of the 13C and 29Si NMR spectra in diamond and silicon / A. A. Lundin, V. E. Zobov // J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 2. - P. 305-315, DOI 10.1134/S1063776118080216. - Cited References: 47. - We thank V.A. Atsarkin, V.V. Demidov, F.S. Dzheparov, and E. B. Feldman for the discussion of our results. This work was supported by a subsidy allocated by the Institute of Chemical Physics of the Russian Academy of Science for the State assignment, theme 0082-2018-0005, code TSITIS AAAA-A18-118020690203. . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
SPIN SYSTEMS
   LINE-SHAPES
   RELAXATION
   SOLIDS
   PARAMAGNETS
   RESONANCE
Аннотация: Based on the proposed theory, we have investigated the shape of the NMR absorption spectra for 13C and 29Si nuclei in diamond and silicon crystals attributable to the internuclear dipole–dipole interaction. In accordance with the available experimental data, we have considered both crystals with a 100% content of magnetoactive isotopes and crystals with a comparatively low dilution by nonmagnetic nuclei. The time correlation functions (the first of which is the Fourier transform of the NMR spectrum) arising in an infinite chain of coupled differential equations are shown to be mutually similar with a slight time delay. The proposed theory allows the spectrum to be calculated analytically. The results obtained agree satisfactorily with the experimental ones. It is noted that the mutual similarity of the time correlation functions is probably a corollary of the development of dynamical chaos in the system.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ

Публикация на русском языке Лундин, Андрей Арнольдович. Асимптотическое подобие временных корреляционных функций и форма спектров ЯМР 13C и 29Si в алмазе и кремнии [Текст] / А. А. Лундин, В. Е. Зобов // Журн. эксперим. и теор. физ. - 2018. - Т. 154 Вып. 2. - С. 354–367

Держатели документа:
Russian Acad Sci, Semenov Inst Chem Phys, Vorobevskoe Sh 26, Moscow 117977, Russia.
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Akademgorodok 50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич; Institute of Chemical Physics of the Russian Academy of Science [0082-2018-0005, TSITIS AAAA-A18-118020690203]
}
Найти похожие

19.

Zobov, V. E.
Concentration dependence of the wings of a dipole-broadened magnetic resonance line in magnetically diluted lattices / V. E. Zobov, M. M. Kucherov // J. Exp. Theor. Phys. - 2017. - Vol. 124, Is. 1. - P. 151-158, DOI 10.1134/S106377611615005X. - Cited References: 34 . - ISSN 1063-7761
Кл.слова (ненормированные):
Drug interactions -- Magnetic fields -- Magnetic resonance -- Magnetism -- Nonlinear equations -- Optical systems -- Autocorrelation functions -- Concentration dependence -- High-frequency asymptotics -- Local field approximations -- Magnetic resonance line -- Modulation frequencies -- Strong static magnetic fields -- Time autocorrelation functions -- Autocorrelation
Аннотация: The singularities of the time autocorrelation functions (ACFs) of magnetically diluted spin systems with dipole–dipole interaction (DDI), which determine the high-frequency asymptotics of autocorrelation functions and the wings of a magnetic resonance line, are studied. Using the self-consistent fluctuating local field approximation, nonlinear equations are derived for autocorrelation functions averaged over the independent random arrangement of spins (magnetic atoms) in a diamagnetic lattice with different spin concentrations. The equations take into account the specificity of the dipole–dipole interaction. First, due to its axial symmetry in a strong static magnetic field, the autocorrelation functions of longitudinal and transverse spin components are described by different equations. Second, the long-range type of the dipole–dipole interaction is taken into account by separating contributions into the local field from distant and near spins. The recurrent equations are obtained for the expansion coefficients of autocorrelation functions in power series in time. From them, the numerical value of the coordinate of the nearest singularity of the autocorrelation function is found on the imaginary time axis, which is equal to the radius of convergence of these expansions. It is shown that in the strong dilution case, the logarithmic concentration dependence of the coordinate of the singularity is observed, which is caused by the presence of a cluster of near spins whose fraction is small but contribution to the modulation frequency is large. As an example a silicon crystal with different 29Si concentrations in magnetic fields directed along three crystallographic axes is considered. © 2017, Pleiades Publishing, Inc.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ

Публикация на русском языке Зобов, Владимир Евгеньевич. Концентрационная зависимость крыльев дипольно-уширенной линии магнитного резонанса в магниторазбавленных решетках [Текст] / В. Е. Зобов, М. М. Кучеров // Журн. эксперим. и теор. физ. - 2017. - Т. 151 Вып. 1. - С. 174–182

Держатели документа:
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Institute of Space and Information Technologies, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kucherov, M. M.; Зобов, Владимир Евгеньевич
}
Найти похожие

20.

Magnetoimpedance and magnetocapacitance of anion-substituted manganese chalcogenides / S. S. Aplesnin [et al.] // J. Appl. Phys. - 2017. - Vol. 121, Is. 7. - Ст. 075701, DOI 10.1063/1.4976097. - Cited References: 26. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 17-42-240079 r_sibir_a. This study was supported by the Russian Foundation for Basic Research project No. 16-52-00045 Bel_a and government work No. 114090470016. . - ISSN 0021-8979
Кл.слова (ненормированные):
Activation energy -- Chalcogenides -- Inorganic compounds -- Manganese -- Neel temperature -- Carrier relaxation time -- Impedance spectroscopy -- Low and high frequencies -- Magnetically ordered state -- Magneto-resistive effect -- Magnetocapacitance -- Pyroelectric current -- Temperature dependence -- Temperature distribution
Аннотация: The magnetoresistive effect in MnSe1−XTeX manganese chalcogenides with a substitute concentration of X = 0.1 is studied by impedance spectroscopy. The magnetoimpedance above the Neel temperature is found. The obtained experimental data are explained in the framework of the model of existence of magnetic nanoareas of two types. Two activation energies in the low- and high-frequency regions are determined from the frequency and temperature dependences of the permittivity described in the Debye model. The extrema found in the temperature dependence of the pyroelectric current are consistent with the maxima in the temperature dependence of magnetization. Temperature dependence of the carrier relaxation time is established. The magnetocapacitance of the MnSe1−XTeX solid solutions is found. The change in the carrier type above the Neel temperature and the temperature of the transition to the magnetically ordered state in the MnTe nanoarea is established.

Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, M. F. Reshetnev Corporation, Krasnoyarsk, Russian Federation
Scientific-Practical Materials Research Center NAS, Minsk, Belarus

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Korolev, V. V.; Sitnikov, M. N.; Yanushkevich, K. I.
}
Найти похожие