Negative electron affinity photocathodes as high-performance electron sources-Part 2: Energy spectrum measurements
- 26 September 1995
- proceedings article
- Published by SPIE-Intl Soc Optical Eng
- Vol. 2550, 189-196
- https://doi.org/10.1117/12.221430
Abstract
The energy spectra of electrons emitted from transmission-mode negative electron affinity photocathodes have been measured at high resolution using a parllel-plate retarding technique. The spectra from GaAs photocathodes have a basic structure that varies with temperature, activation layer qualitites, cathode thickness, and illuminating wavelength. A FWHM energy spread of approximately 50meV at room temperature has been achieved. Spectra from a GaAsP cathode show a markedly different structure and a much wider energy spread.Keywords
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