Abstract
We have confirmed the desorption of Cs atoms from Cs–Sb photocathodes by external irradiation. The desorbed species are estimated as cesium by a work function of the captive filament method. This light-induced desorption is made predominant by the irradiation of infrared light (hν<1 eV), but not by visible light. To explain this phenomenon, the authors have calculated an adiabatic potential diagram of Cs adsorption on a Cs–Sb cathode surface, which safely explains the light-induced desorption.
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