Abstract
The effects of foreign alkali metal ions on the exciton absorption in some alkali chlorides have been investigated. The mixed systems of KCl-RbCl and KCl-NaCl were chosen as characteristic examples. In KCl-RbCl, positions of the exciton peaks shift fairly linearly with the change of relative concentrations of the constituents, and the `chlorine doublet' keeps its structure throughout the full range of concentration. In KCl-NaCl, only the long-wavelength shift of the exciton absorption occurs and the doublet structure undergoes a marked deformation. The results are compared with the X-ray analysis of the mixed samples.
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