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Photostimulated Reorientation of AsO 2 − Centres in Alkali Halides
Author(s) -
Lohmeier F. J.
Publication year - 1985
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.2221300136
Subject(s) - excited state , halide , atomic physics , alkali metal , relaxation (psychology) , ground state , chemistry , excitation , coupling (piping) , symmetry (geometry) , triplet state , physics , materials science , inorganic chemistry , quantum mechanics , social psychology , psychology , organic chemistry , geometry , mathematics , metallurgy
Abstract Molecular arsenite centres in alkali halides show a photostimulated reorientation after excitation to different excited electronic states. The temperature dependence of the reorientation rates is determined. The rates are described in terms of phenomenological rate equations, considering thermal reorientation processes in the electronic ground and excited state. The reorientation parameters for thermally stimulated reorientations are determined for the ground and the excited 3 B 1 state. The low‐temperature photostimulated reorientation, which results from a strong linear electron‐phonon coupling, mainly takes place during the relaxation from the 3 B 1 triplet to the 1 A 1 ground state and is supposed to occur via the A 2 (τ x ) sublevel from which a radiative decay is symmetry‐forbidden.