From a comparison of the relative intensities of photoelectrons with different escape depths for Na, K, Cs, and Sb in several multialkali antimonide photocathodes covering a range of high photosensitivities, a model of the structure of these surfaces can be given. In particular, the results indicate for Na 2 KSb(Cs), the S-20, a surface layer consisting of K 2 CsSb and NaK 2 Sb approximately 30 AA thick over a base layer of Na 2 KSb.
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Galán et al. (1981) studied this question.
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