Negative electron affinity photocathodes as high-performance electron sources Part 2: Energy spectrum measurements

Aaron W. Baum; William E. Spicer; Roger Fabian W. Pease; Kenneth A. Costello; Verle W. Aebi

doi:10.1117/12.221430

26 September 1995 Negative electron affinity photocathodes as high-performance electron sources-Part 2: Energy spectrum measurements

Aaron W. Baum, William E. Spicer, Roger Fabian W. Pease, Kenneth A. Costello, Verle W. Aebi

Author Affiliations +

Proceedings Volume 2550, Photodetectors and Power Meters II; (1995) https://doi.org/10.1117/12.221430
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Aaron W. Baum, William E. Spicer, Roger Fabian W. Pease, Kenneth A. Costello, and Verle W. Aebi "Negative electron affinity photocathodes as high-performance electron sources-Part 2: Energy spectrum measurements", Proc. SPIE 2550, Photodetectors and Power Meters II, (26 September 1995); https://doi.org/10.1117/12.221430

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