Photoemission Study of Cs-NF3 Activated GaAs(100) Negative Electron Affinity Photocathodes

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GaAs based negative electron affinity photocathodes activated with Cs and NF{sub 3} are used as polarized electron sources for linear accelerators. It is generally believed that the activation layer consists of CsF. The activation layers of Cs-NF{sub 3} on GaAs photocathodes are herein investigated using synchrotron radiation photoelectron spectroscopy (SR-PES). F1s, N1s and other core levels are recorded at photon energies ranging from 70eV to 820eV. Surprisingly, a significant amount of nitrogen is observed in the activation layers. Two distinct species of nitrogen are observed, one of which decreases along with the Fluorine signal as the yield of the photocathode ... continued below

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Liu, Z.; Sun, Y.; Peterson, S. & Pianetta, P. May 28, 2008.

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GaAs based negative electron affinity photocathodes activated with Cs and NF{sub 3} are used as polarized electron sources for linear accelerators. It is generally believed that the activation layer consists of CsF. The activation layers of Cs-NF{sub 3} on GaAs photocathodes are herein investigated using synchrotron radiation photoelectron spectroscopy (SR-PES). F1s, N1s and other core levels are recorded at photon energies ranging from 70eV to 820eV. Surprisingly, a significant amount of nitrogen is observed in the activation layers. Two distinct species of nitrogen are observed, one of which decreases along with the Fluorine signal as the yield of the photocathode decays with time.

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  • Journal Name: Appl. Phys. Lett. 92:241107,2008

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  • Report No.: SLAC-PUB-13245
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 928979
  • Archival Resource Key: ark:/67531/metadc899310

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  • May 28, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 30, 2016, 4:42 p.m.

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Liu, Z.; Sun, Y.; Peterson, S. & Pianetta, P. Photoemission Study of Cs-NF3 Activated GaAs(100) Negative Electron Affinity Photocathodes, article, May 28, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc899310/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.