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Uniaxial stress effects of the UV‐absorption bands of In + and T1 + doped alkali halide crystals in a molecular treatment
Author(s) -
Dultz W.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220480214
Subject(s) - halide , anharmonicity , alkali metal , absorption (acoustics) , crystal (programming language) , stress (linguistics) , ion , doping , materials science , atomic physics , analytical chemistry (journal) , chemistry , inorganic chemistry , condensed matter physics , physics , linguistics , philosophy , optoelectronics , organic chemistry , computer science , composite material , programming language , chromatography
Abstract The stress‐induced dichroism of the UV‐absorption bands of KCl:In + and KI:Tl + is investigated. The splitting ratio of the A‐and C‐band under stress is not consistent with predictions of a crystal field model of the defect. This discrepancy is explained by introducing a stress‐dependent axial term of the spin‐orbit coupling which depends on the covalent character of the bond between the defect and its neighbour ions. The strong temperature dependence of the stress effects is a consequence of the anharmonicity of the local elastic constants near the defect.