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Optical absorption of off‐centre Cu + in CsBr
Author(s) -
Rambabu B.,
Ramasastry C.,
Chowdari B. V. R.
Publication year - 1978
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.2220900205
Subject(s) - ion , absorption (acoustics) , liquid helium , absorption spectroscopy , atomic physics , trigonal crystal system , analytical chemistry (journal) , chemistry , atmospheric temperature range , range (aeronautics) , crystal (programming language) , helium , materials science , optics , crystallography , crystal structure , physics , programming language , meteorology , organic chemistry , chromatography , computer science , composite material
Optical absorption studies of Cu + in CsBr are made in the temperature range 300 to 10 K. Nine absorption bands at 6.15, 5.99, 5.80, 5.64, 5.44, 5.33, 5.09, 4.95, and 4.87 eV could be resolved at liquid helium temperature. Their intensities are temperature independent. The observed spectrum is in agreement with the calculated spectrum, if the Cu + ion replaces a Cs + ion and gets displaced along the 〈111〉 direction. The crystal field at Cu + ion is predominently cubic (δ c = —0.45 eV) with a trigonal component (δ t = —0.055 eV) superposed on it.