Non-monotonic behaviour in the mean transverse energy of electrons emitted from a reflection-mode p-GaAs(Cs,O) photocathode during its QE degradation through oxygen exposure

L. B. Jones, H. E. Scheibler, S. N. Kosolobov, A. S. Terekhov, B. L. Militsyn, T. C.Q. Noakes

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Abstract

We present a study on the evolution of both transverse and longitudinal energy distributions due to oxygen-induced quantum efficiency degradation in the electrons emitted from a reflection-mode p-GaAs(Cs,O)-photocathode over an effective electron affinity range of χ ∗∼ -0.1 eV to χ ∗∼ +0.3 eV under illumination wavelengths λ = 808, 635 and 532 nm. For λ = 635 and 532 nm, we found that the mean transverse energy of electrons emitted as the photocathode effective electron affinity increased has a non-monotonic character. Our proposed fitting model links the measured response to changes in the relative number of thermalised and non-thermalised electrons in the total emitted photocurrent.

Original languageEnglish
Article number205301
JournalJournal of Physics D: Applied Physics
Volume54
Issue number20
DOIs
Publication statusPublished - 25 Feb 2021

Keywords

  • degradation
  • electron source
  • energy spread
  • MLE
  • MTE
  • photocathode
  • QE

OECD FOS+WOS

  • 2.05 MATERIALS ENGINEERING
  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY

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