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Optical absorption bands due to the s2 to sp transition in KCl:Sb3+ crystals

UV absorption spectra of KCl:Sb3+ crystals have been studied in detail. Six absorption bands are observed at 271.0, 210.8, 201.7, 199.4, 195.5 and 191.4 nm, the first five bands of which are attributable to the A, B, C1, C2 and C3 bands due to an s2 to sp transition in the Sb3+ ion, while the last is due to the charge-transfer-type D' band.