PHOTOEMISSIVE MATERIALS-A REVIEW

G K BRIDE, C GHOSH

Abstract


This review surveys the development of photo emissive malerials used in practical devices. The phenomenon of photo emission and the criteria for obtaining good photoemis, ion from materials are discussed. The available photoemiss,ve materials and the preparation techniques are described. Alternative phenomena employed for enhancing the photoemission efficience. like interference, high field, and grating tuning are outlined. Finally the present status of work and future trends are indicated.

Keywords


Photoemmission; Pbotocathodes.

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