Photoemission from Metallic Cesium Oxide Films

Abstract
Ultraviolet photoelectron spectra of Cs evaporated onto Ag and oxidized under ultra-high-vacuum conditions have been measured. Time variation of the spectra indicates the formation of Cs suboxides (e.g., Cs7O, Cs11 O3). The high infrared photoelectric yield of Ag/O/Cs cathodes can be explained as due to the excitattion of surface plasmons in these compounds.

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