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Effective dynamical coupling constants of the a‐band of Tl + centers in NaCl, KCl, KBr, and KI
Author(s) -
Oboth K.P.,
Schmitt K.
Publication year - 1983
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.2221190124
Subject(s) - halogen , coupling constant , chemistry , analytical chemistry (journal) , phonon , absorption (acoustics) , coupling (piping) , atomic physics , condensed matter physics , materials science , physics , optics , alkyl , organic chemistry , particle physics , chromatography , metallurgy
The temperature dependence of the A‐absorption band of Tl + centers in NaCl, KCl, KBr, and KI and the stress induced linear dichroism (SLD) are investigated in the region between 4 and 300 K. Moment analysis enables to determine the effective dynamical coupling constants corresponding to the |A〈‐state. The effective phonon frequencies show decreasing values for increasing halogen mass. It turns out that the theory of linear electron—phonon coupling is correct for temperatures up to 200 K in NaCl: Tl + , and KCl:Tl + , and up to 100 K in KBr:Tl + and KI:Tl + .