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An electron spin resonance study of photoproduced trivalent iron and divalent vanadium in silver chloride
Author(s) -
Cheema S. U.,
Smith M. J. A.
Publication year - 1970
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.19700420119
Subject(s) - vanadium , electron paramagnetic resonance , divalent , chloride , chemistry , ion , irradiation , vacancy defect , electron capture , inorganic chemistry , electron , analytical chemistry (journal) , photochemistry , crystallography , nuclear magnetic resonance , physics , organic chemistry , quantum mechanics , chromatography , nuclear physics
A method is described which allows Fe 2+ and V 3+ to be formed in the same specimen of silver chloride. Exposure to blue or to red light produces Fe 3+ and V 2+ . The effect of blue light is explained in terms of hole capture by Fe 2+ and electron capture by V 3+ whereas that of red light is explained in terms of a charge‐transfer absorption by the trivalent forms of iron and vanadium. A re‐arrangement in the environment of Fe 3+ occurs on warming to about 203° K. After blue irradiation at 93° K some of the V 2+ is believed to be associated with two silver‐ion vacancies. A re‐orientation of the vacancies is observed on warming to about 110 and at about 150° K a further re‐orientation takes place and one vacancy is removed. Photoproduced Fe 3+ and V 2+ are stable at 93° K. At room temperature they decay at the same rate with a half life which is of the order of minutes.