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Jahn‐Teller Coupling Parameters from Stress‐Dichroism Spectra for CdS:Ti 2+ and CdS:Co 2+
Author(s) -
Ruszczynski G.,
Boyn R.
Publication year - 1976
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.2220760147
Subject(s) - coupling (piping) , spectral line , impurity , tetrahedron , ion , absorption (acoustics) , molecular physics , perpendicular , absorption spectroscopy , dichroism , materials science , chemistry , crystallography , analytical chemistry (journal) , physics , optics , geometry , metallurgy , mathematics , organic chemistry , astronomy , chromatography
Stress‐induced dichroism spectra are measured for the m A 2 → m T 1 ( m F) and m A 2 → m T 1 ( m P) transitions of CdS:Ti 2+ ( m = 3) and CdS:Co 2+ ( m = 4), at 80 K, for stress parallel and perpendicular to the hexagonal axis. The stress‐induced changes of the first moments of the absorption bands are discussed on the basis of a tetrahedral cluster model. Coupling parameters to ϵ‐ and τ 2 ‐type distortions are estimated, and comparable values are obtained for these two symmetries in all cases. The coupling behaviour of “corresponding” levels of the two impurity systems turns out to be rather similar. The data obtained are consistent with an earlier quantitative interpretation of the absorption band shapes for CdS:Ti 2+ . It is found that a point‐ion model can give the correct sign of the coupling parameters, but leads to wrong results with respect to their (relative) magnitudes.