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Kinetics of Flash‐Stimulated Changes of F‐Centre Absorption in γ‐Irradiated KCl
Author(s) -
Werner B.,
Stradowski C.,
Sugier H.
Publication year - 1980
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.2220990207
Subject(s) - microsecond , quantum tunnelling , irradiation , excited state , kinetics , flash (photography) , absorption (acoustics) , flashing , atomic physics , electron , vacancy defect , ion , materials science , chemistry , analytical chemistry (journal) , optoelectronics , physics , optics , crystallography , nuclear physics , organic chemistry , quantum mechanics , chromatography , composite material
Abstract The decay of F − ‐centres, produced by flashing the γ‐irradiated KCl crystals is studied in the microsecond regime at room temperature. The kinetics of the decay of F − ‐ and recovery of F‐centre absorption bands are compared and a scheme of reactions in the system investigated is proposed. The decay of flash produced F − ‐centres leads initially mainly to the recovery of the F‐band, probably via tunnelling of an electron to an anion vacancy on relatively long distances. The excess energy, released after tunnelling, allows F‐centres subsequently to diffuse and form aggregates. Another possibility is the migration of F‐centres in electronically excited 2p state, leading also to the formation of aggregate centres.