Abstract
The absorption spectra of thin films of RbCl containing 1 mol. % of RbI and KCl containing 1 mol. % of KI measured at low temperature are presented. These spectra show structure which is analogous to the structure seen in the exciton spectra of pure KI and RbI. Both the well known spin orbit doublet and lines corresponding to effective mass states of the bound hole-electron pair appear. An attempt is made to calculate the effective mass of an electron in the host crystal from the absorption spectra. A value of 0.66 is obtained for the case of RbCl : RbI.
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