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Photochemical Properties of SH − Ions in KCl and KBr Crystals
Author(s) -
Facey O. E.,
Jacobs P. W. M.
Publication year - 1967
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.19670190208
Subject(s) - excited state , ion , yield (engineering) , impurity , chemistry , photochemistry , kinetics , hydrogen , thermal , hydrogen atom , atom (system on chip) , quantum yield , atomic physics , materials science , fluorescence , physics , organic chemistry , quantum mechanics , computer science , metallurgy , embedded system , alkyl , meteorology
The photochemistry of KCl and KBr containing SH − impurity ions has been investigated. In addition to the formation of S − and U 2 ‐centres reported previously, U‐centres are formed in high yield and F‐centres in low yield. The thermal contribution to the photochemical process is slight (≈ 0.013 eV). The kinetics of the decay of U 2 ‐centres has been shown to be bimolecular and to correspond mainly to the reaction S − + Hi → SH − , where H i denotes an interstitial hydrogen atom. A model involving the utilization of the thermal energy released during a radiationless transition from the excited state is successfully used to give a qualitative explanation of the data.