Optical Absorption Bands of Off-Center Ag+ in CsBr

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Abstract
The optical absorption bands associated with the d 10 ( 1 S )→ d 9 s ( 1 D , 3 D ) transitions of Ag + in CsBr are studied. The area under the absorption curve decreases with increasing temperature from 10 K to room temperature, indicating that the Ag + ion in CsBr is in a deep off-center potential. Ten optical absorption bands are identified and these are ascribed to the transitions from the d 10 multiplets to the d 9 s multiplets split in a C 3ν symmetry. Good agreement between the experimental and calculated transition energies are obtained, although the poor agreement has been reported for alkali halides with NaCl-structure. This results is discussed in terms of the molecular orbital formation between the Ag + ion and neighboring halogens.