Results 241 to 250 of about 69,355 (279)

F_2^− color centers in LiF crystals

Applied Optics, 1986
Methode d'irradiation gamma pour faire des concentration de centres colores F 2 − utiles pour des applications ...
Y Y, Teng, C A, Carey, J D, Kuppenheimer, J C, Doherty   +3 more
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Impurity centers in ZnSe:Na crystals

Journal of Luminescence, 2011
Abstract The influence of sodium impurity on photoluminescence (PL) spectra of ZnSe crystals doped in a growth process from a Se+Na melt is investigated. It is shown that the introduction of the impurity results in emergence of emission bands in the PL spectra due to the recombination of exciton impurity complexes associated with both donors and ...
G.V. Colibaba, D.D. Nedeoglo, V.V. Ursaki   +2 more
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Color center and radiation center in Lu2SiO5:Ce crystal

Journal of Rare Earths, 2008
Radiation damage of Lu2SiO5:Ce (LSO:Ce) crystals was investigated through intense UV light. An absorption band at 435 nm was observed in the transmission spectrum of the damaged LSO:Ce crystal, similar to that of absorption band caused by gamma ray irradiation.
Laishun QIN, Shen LU, Dongzhou DING, Huanying LI, Guohao REN   +4 more
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Study of Vκ centers in CsI crystal

Solid State Communications, 1973
Vk centers were observed in CsI doped with Na+ and Tl+ after x-ray irradiation at liquid He temperature by using optical and EPR techniques. They are oriented along [100] directions. By studying thermoluminescence, 2 types of thermal migration were found, one due to linear displacement of the centers along the cubic axis and the other due to 90 ...
Sidler, T., Pellaux, J. P., Nouailhat, A., Aegerter, Michel A.   +3 more
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A-centers modifying in CdTe–Yb crystals

Journal of Crystal Growth, 1996
Abstract By means of electrical and magnetic investigation of Yb-doped CdTe crystals, the following was established: (1) Additional shallow donors and paramagnetic centers are not introduced into the doping process; the hole conductivity of doped crystals is controlled by A-centers; their ionization energy depends on Yb impurity concentration (C ...
E.S. Nikonyuk, V.Z. Shlyakhovuy, M.O. Kovalets, M.I. Kuchma, Z.I. Zakharuk, V.M. Frasuniak   +5 more
openaire   +1 more source

Color Centers in Irradiated Durene Crystals

Physica Status Solidi (a), 1981
The optical absorption spectra of γ-irradiated durene single crystals at 77 K are measured using light polarized along the a-, b-, and c′-axes of crystals. In the shorter wavelength region five strong absorption bands are detected. At longer wavelength weak bands at 489 nm with well desolved vibrational structures and relatively broad weak bands at 570
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Secondary photorefractive centers in Sn_2P_2S_6:Sb crystals

Optics Letters, 2011
Secondary photorefractive centers in Sb-doped Sn2P2S6 have a lifetime comparable to the formation time of the space-charge grating. This considerably affects the dynamics of two-beam coupling and results in a new type of transient gain enhancement for preilluminated samples.
Dean R, Evans, Alexandr, Shuymelyuk, Gary, Cook, Serguey, Odoulov   +3 more
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The boron center: A new luminescent center in ZnS crystals

Journal of Luminescence, 1979
Abstract In ZnS crystals containing B, insensitivity of the emission to high pressure, the structure of the excitation spectra and the observed absence of the photo-excited EPR signals suggest that the luminescence may be due to a localized transition between closely associated B Zn and V Zn .
P. Jaszczyn-Kopec, H.D. Fair, D.S. Downs
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F-Centers in BaBrI Single Crystal

IEEE Transactions on Nuclear Science, 2020
In this article, we demonstrate the results of experimental and theoretical studies of F-centers in BaBrI single crystals. We have observed two types of F-centers related to an electron trapped in the iodine or bromine vacancy site. It was found that absorption bands due to F-centers can be induced either by radiation or additive coloration.
Roman Shendrik, Nikolay Popov, Alexandra Myasnikova   +2 more
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Colored Centers in Ionic Crystals

2000
When a vacancy is created in a crystal, an electron may be trapped at this location. This bound electron can absorb light at well defined frequencies, thus changing the color of the crystal.
Jean-Louis Basdevant, Jean Dalibard
openaire   +1 more source