Emission from Hollow Cathodes

摘要

The results of a phenomenological study of hollow cathodes are presented. Evidence has been accumulated to show that an oxide‐coated hollow cathode has two regions of emission with significantly different properties. These are believed to be the coated inner surface of the cavity and a deposit of crystalline material formed on the orifice edge by evaporation from the original coating. Measurements of the relative importance of the two sources have been made under various conditions.