Abstract
Absorption spectra of KCl:In and KCl:Sn are studied at various temperatures, and all the A, B, C and D bands corresponding to those well known in KCl:Tl are found. In KCl:In, the intensities of the A, B and C bands are proved to be proportional to the concentration of In + ions. The ratio of the dipole strength of the C band to that of the A band is found 54 in KCl:In and 18 in KCl:Sn. The position of the B band is 267 mµ (4.64 eV) in KCl:In and 251 mµ (4.9 eV) in KCl:Sn. The relation between the dipole strength and the position of the B band seems to support the theory given by Sugano. Further, it is found that both the A and D bands have a multiplet structure, the A band a doublet and the C band a triplet, both in KCl:In and KCl:Sn. Their origin is discussed.
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