The optical absorption and photoluminescence spectra of multi-alkali photocathodes are presented. The value of the band gap of multi-alkali photocathodes is determined by analysis of these spectra. It has been shown that the band gap Eg is equal to 1.3-1.4 eV. The value of the work function is also determined and the conclusion is drawn that multi-alkali photocathodes are photocathodes with negative or nearly zero electron affinity.
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