Optical characteristics of free and self-mpped excitons are investigated in simple cubic CsCl crystals of high purity The reflection. photoluminescence. cathodoluminescence and x-ray luminescence spectm as well w the excitation spectra for intrinsic. impurity and neardefect emissions and spectra of Lhe anion Frenkel defect creation by radiation are mwured in CsCl crystals at 5-80 K in h e spectral region of 2 to 10 eV. A weak emission at 8.3 eV and ri-emission of self-trapped excitons (2.82 eV) are detected in CcCl at 5 K. The energy gap is estimared 3s Eg = 8.4 eV at 5 K. Some peculiarities of the ndiative and non-radiative decay of excitons in sc CsCl in comparison with those of FCC KCI and RbCl crystals m discussed.

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