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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aksenov A. E., Fedorov Y. M., Leksikov Al. A.
Заглавие : Peculiarities of photo-luminescence of anti-ferromagnetic KMNF3
Место публикации : Fiz. Nizk. Temp. - 1982. - Vol. 8, Is. 3. - P.320-323. - ISSN 0132-6414
Примечания : Cited References: 8
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AVERYANOV E. M.
Заглавие : POLARIZED LUMINESCENCE SPECTRUM OF IMPURITY LIQUID-CRYSTAL - THE DEGENERATION LIFTED AND RENEWED BY RELAXATION
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 103, Is. 6. - P2018-2038. - ISSN 0044-4510
Примечания : Cited References: 45
Предметные 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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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Kuzubov A. A., Fedorov A. S., Sorokin P. B., Tomilin F. N., Maeda Y.
Заглавие : Density-functional theory study of the electronic structure of thin Si/SiO2 quantum nanodots and nanowires
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2007. - Vol. 75, Is. 20. - Ст.205427. - ISSN 1098-0121, DOI 10.1103/PhysRevB.75.205427
Примечания : Cited References: 63
Предметные 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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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Gudim I. A., Krylov A. S., Temerov V. L.
Заглавие : Luminescence of yttrium aluminum borate single crystals doped with manganese
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 9. - P1695-1699. - ISSN 1063-7834, DOI 10.1134/S1063783407090156
Примечания : Cited References: 10
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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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tomilin F. N., Antipina L. Yu., Ovchinnikov S. G., Vysotski E. S.
Заглавие : The theoretical studies of light emitters in bioluminescence of Ca2+-regulated photoprothin obelin
Место публикации : Luminescence. - 2008. - Vol. 23, Is. 2. - P.96
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Boldyrev K. N., Petit P. O., Viana B., Bezmaternykh L. N.
Заглавие : High-resolution spectroscopy of YbAl(3)(BO(3))(4) stoichiometric nonlinear laser crystals
Коллективы :
Разночтения заглавия :авие SCOPUS: High-resolution spectroscopy of YbAl3(BO3) 4 stoichiometric nonlinear laser crystals
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2008. - Vol. 20, Is. 45. - Ст.455210. - ISSN 0953-8984, DOI 10.1088/0953-8984/20/45/455210
Примечания : 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.
Предметные рубрики: YB-YAB LASER
GROWTH
FREQUENCY
BORATE
Ключевые слова (''Своб.индексиров.''): 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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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Kuzubov A. A., Fedorov D. G., Irle S., Morokuma K.
Заглавие : Strong Electron Correlations Determine Energetic Stability and Electronic Properties of Er-Doped Goldberg-Type Silicon Quantum Dots
Место публикации : J. Phys. Chem. C. - 2009. - Vol. 113, Is. 36. - P.15964-15968. - SEP 10. - ISSN 1932-7447, DOI 10.1021/jp904996e
Примечания : 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
Предметные рубрики: IMPLANTED POROUS SILICON
AUGMENTED-WAVE METHOD
MU M LUMINESCENCE
SI NANOCRYSTALS
THIN-FILMS
BASIS-SET
ERBIUM
PHOTOLUMINESCENCE
DENSITY
PSEUDOPOTENTIALS
Ключевые слова (''Своб.индексиров.''): 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.
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tomilin F. N., Antipina L Yu., Eremeeva E. V., Ovchinnikov S. G., Vysotski E. S.
Заглавие : Quantum chemical study of mechanism of active photoprotein generation
Место публикации : Luminescence. - 2010. - Vol. 25, Is. 2. - P.210-211. - ISBN 1522-7235
Примечания : Cited Reference Count: 4
Предметные рубрики:
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasiliev, Alexander D., Cherepakhin, Alexander V., Zaitsev, Alexander I.
Заглавие : The trigonal polymorph of strontium tetraborate, beta-SrB4O7
Место публикации : Acta Crystallogr. Sect. E.-Struct Rep. Online. - MALDEN: WILEY-BLACKWELL, 2010. - Vol. 66, Part 6. - С. I48-U132. - JUN. - ISSN 1600-5368, DOI 10.1107/S1600536810019069
Примечания : 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]
Предметные рубрики: CRYSTAL-STRUCTURE
SRB4O7
LUMINESCENCE
MODEL
Ключевые слова (''Своб.индексиров.''): 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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Gudim I.A., Krylov A.S., Malakhovskii A.V., Temerov V.L.
Заглавие : Up-Conversion Luminescence of YAl3(BO3)4:(Yb3+,Tm3+) Crystals
Место публикации : J. Alloys and Compounds. - 2010. - Vol. 496. - С. L18-L21
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