Abstract: The effects of vacuum-baking on the chemical state of CsI photocathodes are studied with x- ray photoelectron spectroscopy (XPS) in this paper. The experimental results indicate that when the vacuum-baking temperature is below 180$DGR@C the chemical states of CsI photocathode are stable, but there is a sublimation of CsI with low rate in high vacuum. When the vacuum-baking temperature is higher than 180$DGR@C, chemical shifts will occur. !9
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