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Effect of ultraviolet irradiation on Se 2− ‐anion vacancy dipoles in potassium iodide
Author(s) -
Prakash J.
Publication year - 1983
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.2221150115
Subject(s) - irradiation , electric field , dipole , vacancy defect , ion , absorption (acoustics) , analytical chemistry (journal) , materials science , electric dipole transition , absorption band , ultraviolet , chemistry , photochemistry , molecular physics , atomic physics , radiochemistry , optoelectronics , optics , magnetic dipole , crystallography , physics , organic chemistry , chromatography , quantum mechanics , nuclear physics , composite material
The absorption bands due to an isolated Se 2− ‐anion vacancy dipole in KI are located at 275, 291, 371, and 395 nm. It is observed that the irradiation in the 275 and 291 nm absorption bands results in a photo‐chemical reaction. Irradiation in the 395 nm absorption band in the presence of an electric field creates a situation in which more dipoles are aligned along the electric field direction whereas such an irradiation in the absence of the electric field destroys the preferred orientation of the frozen‐in polarized dipoles. The effect of UV irradiation is studied as a function of electric field strength, irradiation temperature, and irradiation time.