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A method by which negative electron affinity GaAs photocathodes can be made to recover their photoyield following decay is reported. The source of decay can be either an oxidizer in the background gas or gas introduced through deliberate dosing. Conventional methods employ the use of the alkali Cs as the photoyield recovery agent. This work describes an alkali application-free method, similar to electron stimulated desorption, for photoyield recovery.
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Mulhollan et al. (2010) studied this question.
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