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Original Title
Durchstimmbare Farbzentrenlaser
Source
Oesterreichische Physikalische Gesellschaft, Vienna; 112 p; Oct 1985; p. 12; 1985 Annual convention of the Austrian Physical Society; Vienna (Austria); 23-27 Sep 1985; Published in summary form only.
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AbstractAbstract
[en] Published in summary form only
Original Title
Halogenetos alcalinos com centros de cor: candidatos para geracao fotoquimica de buracos
Source
Almeida Fonseca, A.L. de (Brasilia Univ., DF (Brazil)); Koiler, B. (Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)); Brescansin, L.M. (Universidade Estadual de Campinas, SP (Brazil)) (and others); Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 284 p; 1990; p. 191; 13. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil
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AbstractAbstract
No abstract available
Original Title
Centros de cor no NaCl
Source
35. Annual Meeting of the Brazilian Society for the Advancement of Science; Belem, PA (Brazil); 6-13 Jul 1983; Published in summary form only.
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Journal Article
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Journal
Cienc. Cult. (Sao Paulo) Supl; v. 35(7); p. 272
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Castagnet, A.C.; Rocca, H.C.C.; Rostilato, M.E.C.M.
Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo, SP (Brazil)1989
Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo, SP (Brazil)1989
AbstractAbstract
[en] The presence of defects and impurities in the crystal lattice alters the eletric field distribution within the crystal, allowing the electrons to occupy energy levels in the forbbiden band. Ionizing radiation supply the required energy to permit the electrons originaly bound to lattice atoms, to occupy effectively those intermediate levels, forming color centers. Dependig upon the nature and energy of the radiation, it is possible to produce defects in regions of the crystal, generating color centers. Based on these premises, a technique to induce color in originally colorless topaz, by using the IEA-R1 nuclear reactor, was developed at Engineering and Industrial Application Department (TE). Samples were irradiated inside iron capsules coated with cadmium foils. The iron, and principaly the cadmium, absorb the thermal neutrons that could activate crystal impurities generating long-lived radioisotopes. The epithermal neutrons that overpass the iron and cadmium barriers interact with the crystal atoms, causing lattice defects which give rise to color center, by subsequent ionization processes. The procedure used at TE induces permanent blue color, in natural colorless topaz. (author)
[pt]
A presenca de defeitos e impurezas na rede cristalina altera a distribuicao do campo eletrico de um cristal, permitindo que alguns eletrons possam ocupar niveis de energia localizados dentro da faixa proibida. As radiacoes ionizantes fornecem a energia necessaria para que os eletrons, originalmente ligados aos atomos do cristal, possam, efetivamente ocupar esses niveis, criando assim, centros de cor. Dependendo da natureza e energia da radiacao utilizada, e possivel produzir defeitos em regioes do cristal, gerando centros de cor. Com base nessas premissas, o Departamento de Aplicacoes na Engenharia e na Industria (TE) desenvolveu uma tecnica de inducao de cor em cristais de topazio, originalmente ligados aos atomos do cristal, possam, efetivamente ocupar esses niveis, criando assim, centros de cor. Dependendo da natureza e energia da radiacao utilizada, e possivel produzir defeitos em regioes do cristal, gerando centros de cor. Com base nessas premissas, o Departamento de Aplicacoes na Engenharia e na Industria (TE) desenvolveu uma tecnica de inducao de cor em cristais de topazio, originalmente incolores, utilizando o reator nuclear IEA-R1. As amostras foram irradiadas em um involucro de ferro, revestido internamente com cadmio. O ferro e principalmente o cadmio, absorvem os neutrons termicos que poderiam ativar as impurezas do cristal e gerar, assim, radioisotopos de meia-vida longa. Os neutrons epitermicos que ultrapassam as barreiras do ferro e do cadmio, ao interagirem com os atomos do cristal, provocam defeitos na rede cristalina, subsequentemente convertidos em novos centros de cor, por processos de ionizacao. O procedimento utilizado pelo TE induz a cor azul permanente nos cristais de topazio. (autor)Original Title
Inducao de cor, por irradiacao, em cristais de topazio
Source
Aug 1989; 26 p
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AbstractAbstract
No abstract available
Original Title
Estudo experimental da distribuicao dos centros de cor na estrutura do quartzo enfumacado
Source
33. Annual Meeting of the Brazilian Society for the Advancement of Science; Salvador, Brazil; 8 - 15 Jul 1981; Published in summary form only.
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Cienc. Cult. (Sao Paulo) Supl; v. 33(7); p. 263
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Luminescence and coloration of undoped and Ti-doped sapphire crystals grown by Czochralski technique
Alombert-Goget, G.; Li, H.; Guyot, Y.; Brenier, A.; Lebbou, K., E-mail: kheirreddine.lebbou@univ-lyon1.fr2016
AbstractAbstract
[en] Undoped and Ti-doped sapphires crystals were grown under stationary stable regime. The effect of growth parameters on the formation of color center is evaluated by absorption and luminescence measurements. The grown crystals with pulling rate less than 5 mm/h presents less F+ center, therefore demonstrates a better crystal quality. - Highlights: • Undoped and Ti-doped sapphire crystals were grown by a Czochralski technique. • The optical quality of the grown crystal and coloration was investigated by photoluminescence. • In the case of sapphire crystals, increasing pulling rate can create color centers.
Primary Subject
Source
ICL'14: 17. international conference on luminescence and optical spectroscopy of condensed matter; Wroclaw (Poland); 13-18 Jul 2014; S0022-2313(15)00072-1; Available from http://dx.doi.org/10.1016/j.jlumin.2015.02.001; Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] In addition to the intrinsic blue emission band near 430 nm for an ideal PbWO4 scheelite structure, the presence of three extra emission bands peaking near blue-green and green-red colors was clearly identified for thermally synthesized bulk crystals with the help of a reliable fitting process applicable for microscopic analysis of recorded PL spectra. The origin, nature, and electro-optical behaviors of the extra emission bands are strongly related to the structural change from an ideal scheelite to modified ones, so now we can more closely track down the nature and the relevant behaviors, which are still in dispute, of the apparent colors of the PbWO4 scintillating medium by constructing structural models and by considering the energy transfer mechanism between the color centers
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Secondary Subject
Source
19 refs, 2 figs
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Journal Article
Journal
Journal of the Korean Physical Society; ISSN 0374-4884;
; v. 39(2); p. 197-199

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Baldacchini, G.; Bonfigli, F.; Menchini, F.; Montereali, R.M., E-mail: montereali@frascati.enea.it2002
AbstractAbstract
[en] The stable formation of several colour centres (CCs) has been investigated in lithium fluoride (LiF) single crystals irradiated at room temperature (RT) and at 213 K by 5 MeV electrons with doses from 1019 to 1023 eV/cm3. The temperature during irradiation influences the production of aggregate defects, in particular the ratio between the F3+ and F2 laser active centres and the amount of parasitic complex defects. Optical absorption and photoluminescence spectra allow clarifying the role of different aggregate defects on the emission properties of the F3+ and F2 centres at concentrations up to 1018 cm-3
Secondary Subject
Source
S0168583X02005621; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms; ISSN 0168-583X;
; CODEN NIMBEU; v. 191(1-4); p. 216-220

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Darikova, A.; Vanickova, M.; Matejec, V.; Pospisilova, M.
Centre National de l'Energie, des Sciences et des Techniques Nucleaires (CNESTEN), Rabat (Morocco); Association des Ingenieurs en Genie Atomique du Maroc, Casablanca (Morocco); Office Cherifien des Phosphates (OCP), Casablanca (Morocco); Office National d'Electricite (ONE), Casablanca (Morocco); Faculte des Sciences, Rabat (Morocco). Lab. de Physique1994
Centre National de l'Energie, des Sciences et des Techniques Nucleaires (CNESTEN), Rabat (Morocco); Association des Ingenieurs en Genie Atomique du Maroc, Casablanca (Morocco); Office Cherifien des Phosphates (OCP), Casablanca (Morocco); Office National d'Electricite (ONE), Casablanca (Morocco); Faculte des Sciences, Rabat (Morocco). Lab. de Physique1994
AbstractAbstract
[en] Some optical waveguides used for communication purposes are very sensitive to ionizing radiation.Ionizing radiation radiation affects the optical waveguides by creating color centers that are responsible for the transmission loss.This transmission loss is the function of wavelength of the passing light. The dose of ionizing radiation will manifest itself not only in the magnitude of the transmission loss value but even in changing the position of maximum of the transmission loss curve with respect to the wavelength. The position of the maximum is stable in time and temperature and independent of dose rate. The study of effects of ionizing radiation on the optical waveguides leads to the possibility of utilizing them not only as sensors of ionizing radiation but even as a dosimeters. 4 figs., 2 refs. (author)
Source
1994; 2 p; 6. International Symposium on Radiation Physics (ISRP-6); Rabat (Morocco); 18-22 Jul 1994; Available from Faculte des Sciences, Laboratoire de physique, Rabat (MA)
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AbstractAbstract
[en] Using confocal fluorescence microscopy technique, we observed experimentally the luminescence of single F_2 color centers in LiF crystal. It is disclosed that the fluorescence shows blinking behavior. It is shown that this phenomenon is caused by the F_2 center reorientation occurring during the experiment. The ratio of luminescence intensities of differently oriented centers is assessed theoretically for two different experiment configurations. The calculated ratios are in fine agreement with experimental result
Primary Subject
Source
EFRE-2014: International Congress on Energy Fluxes and Radiation Effects; Tomsk (Russian Federation); 21-26 Sep 2014; Available from http://dx.doi.org/10.1088/1742-6596/552/1/012048; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 552(1); [4 p.]

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