title: Detection of soft x rays with NEA III-V photocathodes.
abstract: We describe the experimental energy response of a negative electron affinity (NEA) III-V photocathode to x rays with energies from approximately 0.8 to approximately 3 keV. Energy resolutions, E/DeltaE, from approximately 1 to approximately 3 are obtained, together with approximately 100% quantum efficiency. Theoretical calculations based on an electron diffusion model are shown to be in good agreement with the experimental results. The use of NEA III-V photocathodes as efficient soft x-ray detectors with good energy and spatial resolution is discussed for imaging applications in x-ray astronomy.
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138Light Sensing and Emitting Division, Varian Associates, Inc. 601 California Ave., Palo Alto, California 94303.
authors.forename: D
authors.initials: D
authors.lastname: Bardas
authors.forename: E
authors.initials: E
authors.lastname: Kellogg
authors.forename: S
authors.initials: S
authors.lastname: Murray
authors.forename: R
authors.initials: R
authors.lastname: Enck