Operating experience with a GaAs photoemission electron source

We report on the development of several operating procedures that promise to make GaAs photoemission electron sources easier to construct, more reliable to operate, and more amenable to use in dynamic vacuum systems. We describe in particular a method for ‘‘ohmically’’ heating a 〈100〉 crystal of GaA...

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Bibliographic Details
Published in:Review of scientific instruments 1986-12, Vol.57 (12), p.3004-3011
Main Authors: Tang, F. C., Lubell, M. S., Rubin, K., Vasilakis, A., Eminyan, M., Slevin, J.
Format: Article
Language:English
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Summary:We report on the development of several operating procedures that promise to make GaAs photoemission electron sources easier to construct, more reliable to operate, and more amenable to use in dynamic vacuum systems. We describe in particular a method for ‘‘ohmically’’ heating a 〈100〉 crystal of GaAs under vacuum to approximately 600 °C. We also discuss our observations of the role of oxygen in the activation of the crystal surface, the use of continuous cesiation, and of the performance of the crystal under varying vacuum conditions.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1138982