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- W1990265517 abstract "For four anionic impurity centers with S2-configuration (H−, Cu−, Ag−, and Au− centers) and the F center in alkali halides, a correlation between the peak energy, E, of the absorption band concerned and the lattice constant, d is extensively investigated. All the results indicate that the Smakula (STSN) relation, E = ad−n, holds for every alkali family (a and n are adjustable parameters). The values of exponent, n, derived from the analysis for all centers treated show a systematic variation with the defect center, the absorption band, and the alkali ion. It seems that the factor n expresses a degree of the lattice relaxation. In fact, a relation between the n-value and the Stokes-shift ΔE concerned, is very simple. An empirical relation, ΔE = bnk, roughly holds and the constants b and k depend only on the crystal structures of the alkali halides. Pour les quatre centres d'impuretés anioniques avec la configuration s2 (centres H−, Cu−, Ag− et Au−) et le centre F dans les halogénures alcalins, une corrélation entre l'énergie à la pointe, E, de la bande d'absorption et la constante réticulaire, d, a été recherché. Tous les résultats indiquent que la relation de Smakula (STSN), E = ad−n, s'applique à chaque famille d'alcalin (a et n sont les paramètres pour l'ajustement). Les valeurs des facteurs d'exposant n obtenus à l'aide de l'analyse à data pour toutes les bandes recherchées ici exposent une variation systématique avec le centre des défaut, la bande d'absorption et l'ion alcalin. II semble que le facteur n peut exprimer un degré de la relaxation à le treillis. En fait, une relation entre la valeur de n et le déplacement de Stokes ΔE est trés simple. Une relation empirique, ΔE = bnk, est tenu pour grossièrement et les constantes b et k dépendent seulement de la structure des cristaux de l'halogénure alcalin." @default.
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- W1990265517 date "1984-03-01" @default.
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- W1990265517 title "A Correlation between the Spectral Location of the Absorption Bands Due to the Localized Centers and the Lattice Constant in Alkali Halide Crystals. Anionic Impurity Centers with S2-Configuration and F Center which Have Cubic Symmetry" @default.
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- W1990265517 doi "https://doi.org/10.1002/pssb.2221220132" @default.
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