Abstract
Optical characteristics of free and self-trapped excitons are investigated in simple cubic CsCl crystals of high purity. The reflection, photoluminescence, cathodoluminescence and X-ray luminescence spectra, as well as the excitation spectra for intrinsic, impurity and near-defect emissions and spectra of the anion Frenkel defect creation by radiation are measured in CsCl crystals at 5-80 K in the spectral region of 2 to 10 eV. A weak emission at 8.3 eV and pi -emission of self-trapped excitons (2.82 eV) are detected in CsCl at 5 K. The energy gap is estimated as Eg=8.4 eV at 5 K. Some peculiarities of the radiative and non-radiative decay of excitons in SC CsCl in comparison with those of FCC KCl and RbCl crystals are discussed.
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