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Light-Induced Desorption of Cs from the Cs–Sb Photoemissive Cathode

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.