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Aksenov, A. E.
Peculiarities of photo-luminescence of anti-ferromagnetic KMNF3 / A. E. Aksenov, Y. M. Fedorov, Al. A. Leksikov // Fiz. Nizk. Temp. - 1982. - Vol. 8, Is. 3. - P. 320-323. - Cited References: 8 . - ISSN 0132-6414

РУБ Physics, Applied

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Доп.точки доступа:
Fedorov, Y. M.; Leksikov, Al. A.; Лексиков, Александр Александрович
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AVERYANOV, E. M.
POLARIZED LUMINESCENCE SPECTRUM OF IMPURITY LIQUID-CRYSTAL - THE DEGENERATION LIFTED AND RENEWED BY RELAXATION / E. M. AVERYANOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 103, Is. 6. - P. 2018-2038. - Cited References: 45 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
RESOLVED FLUORESCENCE DEPOLARIZATION
   UNIAXIAL MOLECULAR SAMPLES
   NEMATIC ORDER PARAMETERS
   EXCITED-STATES
   SPECTROSCOPY
   MEMBRANES
   FLUOROPHORES
   ORIENTATION
   TRANSITION
   DYES
Аннотация: The general molecular-statistical approach is proposed for the analysis or the polarized luminescence spectrum for impurity molecule of an arbitrary symmetry in the nematic liquid crystal matrix. On the particular example of uniaxial molecules the influence of features of the molecular electron structure, orientational statistics, molecular dynamics, and features of the anisotropic intermolecular coupling upon the positions of maxima v(if)(t) of impurity fluorescence polarized bands J(ij)(t) is studied. For the first time it is shown that all these factors significantly affect the degree of spectrum v(ij)(t) degeneration. For t not-equal 0, relaxation of excited impurity molecule subsystem toward the orientational distribution lifts a partial degeneration of spectrum v(ij), occuring at t not-equal 0, and renews partial or total degeneration of spectrum v(ij) in the limit t = infinity. In the lack of the spectrum v(ij) degeneration for t = 0 the relaxation may restore partial degeneration for t not-equal 0 as a function of the features of electron structure of molecules. The results of work explain the familiar experimental data on the number of independent component v(ij) and relation between them, on dependence of v(ij) upon the order of matrix and impurity subsystem, on the mutual relation in the positions of impurity band polarized component in the absorption and fluorescence spectra.

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Density-functional theory study of the electronic structure of thin Si/SiO2 quantum nanodots and nanowires / P. V. Avramov [et al.] // Phys. Rev. B. - 2007. - Vol. 75, Is. 20. - Ст. 205427, DOI 10.1103/PhysRevB.75.205427. - Cited References: 63 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ERBIUM ION LUMINESCENCE
   TOTAL-ENERGY CALCULATIONS
   WAVE BASIS-SET
   POROUS SILICON
   OPTICAL-PROPERTIES
   OXIDIZED SI
   SEMICONDUCTOR NANOWIRES
   PHASE-TRANSFORMATIONS
   NANOCRYSTALS
   CONFINEMENT
Аннотация: The atomic and electronic structures of a set of proposed pentagonal thin (1.6 nm in diameter) silicon/silica quantum nanodots (QDs) and nanowires (NWs) with narrow interface, as well as parent metastable silicon structures (1.2 nm in diameter), were studied using cluster B3LYP/6-31G(*) and periodic boundary condition (PBC) plane-wave (PW) pseudopotential (PP) local-density approximation methods. The total density of states (TDOS) of the smallest quasispherical QD (Si-85) corresponds well to the PBC PW PP LDA TDOS of the crystalline silicon. The elongated SiQDs and SiNWs demonstrate the metallic nature of the electronic structure. The surface oxidized layer opens the band gap in the TDOS of the Si/SiO2 species. The top of the valence band and the bottom of conduction band of the particles are formed by the silicon core derived states. The theoretical band gap width is determined by the length of the Si/SiO2 clusters and describes the size confinement effect in the experimental photoluminescence spectra of the silica embedded nanocrystalline silicon with high accuracy.

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Держатели документа:
Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki Branch, Takasaki, Gumma 3701292, Japan
Russian Acad Sci, LV Kirensky Phys Inst, SB, Krasnoyarsk 660036, Russia
Russian Acad Sci, NM Emanuel Inst Biochem Phys, Moscow 119334, Russia
Kyoto Univ, Dept Energy Sci & Technol, Kyoto 6068501, Japan
ИФ СО РАН

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Kuzubov, A. A.; Кузубов, Александр Александрович; Fedorov, A. S.; Федоров, Александр Семенович; Sorokin, P. B.; Tomilin, F. N.; Томилин, Феликс Николаевич; Maeda, Y.
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Luminescence of yttrium aluminum borate single crystals doped with manganese / A. S. Aleksandrovsky [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 9. - P. 1695-1699, DOI 10.1134/S1063783407090156. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The optical absorption and luminescence spectra of single crystals of yttrium aluminum borate YAl3(BO3)(4) doped with manganese ions are measured. It is established that the optical absorption spectra of yttrium aluminum borate single crystals doped with manganese ions are determined primarily by the contribution from the Mn4+ ions. The luminescence spectra of the YAl3(BO3)(4) single crystals doped with manganese exhibit narrow lines attributed to the Mn4+ ions and an extended multiband structure which is associated primarily with the contribution from the Mn2+ ions.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Krylov, A. S.; Крылов, Александр Сергеевич; Temerov, V. L.; Темеров, Владислав Леонидович
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The theoretical studies of light emitters in bioluminescence of Ca2+-regulated photoprothin obelin / Tomilin F.N., Antipina L.U., Ovchinnikov S.G. and Vysotski E.S. // Luminescence. - 2008. - Vol. 23, Is. 2. - P. 96

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Antipina, L. Yu.; Антипина, Любовь Юрьевна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vysotski, E. S.; Высоцкий, Евгений Степанович
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High-resolution spectroscopy of YbAl(3)(BO(3))(4) stoichiometric nonlinear laser crystals / M. N. Popova [et al.] // J. Phys.: Condens. Matter. - 2008. - Vol. 20, Is. 45. - Ст. 455210, DOI 10.1088/0953-8984/20/45/455210. - Cited References: 20. - The authors thank E Antic-Fidancev for helpful discussions on the 'barycenter curves', P Aschehoug for technical assistance, and B Mavrin for assistance in Raman spectra measurements. This work was supported by the CNRS-RAS exchange program (project No. 21241), by the Russian Foundation for Basic Research (Grants Nos 07-02-01185 and 06-02-16088), and by the Russian Academy of Sciences under the Programs for Basic Research. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
YB-YAB LASER
   GROWTH
   FREQUENCY
   BORATE
Кл.слова (ненормированные):
Crystal symmetry -- Crystals -- Light emission -- Light sources -- Luminescence -- Spectroscopic analysis -- Ytterbium -- Electronic levels -- High resolutions -- Luminescence spectroscopies -- Main lines -- Nonlinear laser crystals -- Raman spectrums -- Vibronic structures -- Weak lines -- Single crystals
Аннотация: We present temperature-dependent high-resolution polarized transmittance spectroscopy as well as luminescence spectroscopy of YbAl(3)(BO(3))(4) single crystals. Positions and symmetries of all the Yb(3+) crystal-field electronic levels have been found from the analysis of the spectra. Near the main line of the optical transition (2)F(7/2)(0) -> (2)F(5/2)(0) we observe a lot of narrow weak lines. These lines point to the presence of several different distorted sites of Yb(3+). We analyze the possible origin of the distorted sites. Vibronic structure in transmittance and luminescence spectra was observed and compared with room-temperature Raman spectra.

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Держатели документа:
[Popova, M. N.
Boldyrev, K. N.] Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
[Petit, P. O.
Viana, B.] Ecole Natl Super Chim Paris 11, Lab Chim Mat Condensee Paris, CNRS UMR 7574, F-75005 Paris, France
[Bezmaternykh, L. N.] RAS, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, 5 Fizicheskaya street, Troitsk, Moscow region 142190, Russian Federation
Laboratoire de Chimie de la Matiere Condensee de Paris, CNRS-UMR 7574, Ecole Nationale Superieure de Chimie de Paris 11, rue Pierre et Marie Curie, F-75005 Paris, France
Kirenskii Institute of Physics, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Popova, M. N.; Boldyrev, K. N.; Petit, P. O.; Viana, B.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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    Strong Electron Correlations Determine Energetic Stability and Electronic Properties of Er-Doped Goldberg-Type Silicon Quantum Dots / P. V. Avramov [et al.] // J. Phys. Chem. C. - 2009. - Vol. 113, Is. 36. - P. 15964-15968, DOI 10.1021/jp904996e. - Cited Reference Count: 43. - Гранты: This work was supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Tcchnology Agency (JST) and a collaborative RFBR-JSPS Grant 0902-92107-Phi. One of the authors (S.I.) also acknowledges support by the Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology (SCF) commissioned by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. - Финансирующая организация: Japan Science and Tcchnology Agency (JST); RFBR-JSPS Grant; Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan . - SEP 10. - ISSN 1932-7447
Рубрики:
IMPLANTED POROUS SILICON
   AUGMENTED-WAVE METHOD
   MU M LUMINESCENCE
   SI NANOCRYSTALS
   THIN-FILMS
   BASIS-SET
   ERBIUM
   PHOTOLUMINESCENCE
   DENSITY
   PSEUDOPOTENTIALS
Кл.слова (ненормированные):
Ab initio -- Atomic structure -- Density functionals -- Empirical pseudo-potential -- Endohedrals -- Energetic stability -- Er-doped -- Erbium complexes -- Erbium ion -- Experimental data -- Hartree-fock -- Many body perturbation theory -- Mass centers -- Perturbation approach -- Plane wave -- Pseudopotentials -- Quantum Dot -- Silicon quantum dots -- Strong binding -- Strong electron correlations -- Theoretical result -- Crystal atomic structure -- Electron correlations -- Electron density measurement -- Electronic properties -- Electronic structure -- Erbium -- Perturbation techniques -- Structural optimization -- Semiconductor quantum dots
Аннотация: Atomic and electronic structures of Goldberg-type silicon quantum dots and their endohedral erbium complexes were studied using ab initio and plane wave pseudopotential density functional and Moller-Plesset many-body perturbation theories. During atomic structure optimizations, the erbium ions occupy mass centers inside the central hollows of quantum dots of different symmetries. It was found that strong electron correlations within the Er 4f shell taken into account by empirical pseudopotential and post-Hartree-Fock perturbation approaches are responsible for strong binding of Er ions to quantum dots. We elucidate the effects of symmetry and discuss theoretical results in comparison to available experimental data,

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http://pubs.acs.org/doi/abs/10.1021/jp904996e.
Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Natl Inst Adv Ind Sci & Technol, RICS, Tsukuba, Ibaraki 3058568, Japan
Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648602, Japan
Nagoya Univ, Dept Chem, Nagoya, Aichi 4648602, Japan
Kyoto Univ, Fukui Inst Fundamental Chem, Sakyo Ku, Kyoto 6068103, Japan

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Kuzubov, A. A.; Кузубов, Александр Александрович; Fedorov, D. G.; Irle, S.; Morokuma, K.
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Quantum chemical study of mechanism of active photoprotein generation / F. N. Tomilin [et al.] // Luminescence. - 2010. - Vol. 25, Is. 2. - P. 210-211. - Cited Reference Count: 4 . - ISBN 1522-7235
Рубрики:

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Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Antipina, L Yu.; Антипина, Любовь Юрьевна; Eremeeva, E. V.; Еремеева, Елена Владимировна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vysotski, E. S.; Высоцкий, Евгений Степанович
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    The trigonal polymorph of strontium tetraborate, beta-SrB4O7 [Text] / A. D. Vasiliev, A. V. Cherepakhin, A. I. Zaitsev // Acta Crystallogr. Sect. E.-Struct Rep. Online. - 2010. - Vol. 66, Part 6. - PI48-U132, DOI 10.1107/S1600536810019069. - Cited Reference Count: 22. - Гранты: We thank the State Program for Support of Leading Scientific Schools (grant LS-4645.2010.2.). - Финансирующая организация: Leading Scientific Schools [LS-4645.2010.2] . - JUN. - ISSN 1600-5368
Рубрики:
CRYSTAL-STRUCTURE
   SRB4O7
   LUMINESCENCE
   MODEL
Кл.слова (ненормированные):
Tetra
Аннотация: The asymmetric unit of the title compound, beta-SrB4O7, contains five Sr atoms (three located on a threefold rotation axis), twelve B and 21 O atoms. The structure is made up from BO3 triangles and BO4 tetrahedra in a 1:1 ratio. Pairs of BO3 triangles are linked to BO4 tetrahedra via common corners, forming chains. These chains are further linked to adjacent chains through corner-sharing, leading to a three-dimensional framework with channels running parallel to [001]. The Sr2+ ions reside in the channels and exhibit strongly distorted polyhedra The density of the beta-polymorph is considerably lower than that of beta-SrB4O7, which is constructed solely from BO4 tetrahedra.

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Держатели документа:
Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Vasiliev, Alexander D.; Cherepakhin, Alexander V.; Zaitsev, Alexander I.
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10.

Up-Conversion Luminescence of YAl3(BO3)4:(Yb3+,Tm3+) Crystals [Text] / Aleksandrovsky A.S.Gudim I.A. [et al.] // J. Alloys and Compounds. - 2010. - Vol. 496. - PL18-L21

Доп.точки доступа:
Aleksandrovsky, A.S.; Gudim, I.A.; Krylov, A.S.; Malakhovskii, A.V.; Temerov, V.L.
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