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Energy distributions of electrons emitted from reflection-mode Cs-covered GaAs photocathodes



Energy distributions of electrons emitted from reflection-mode Cs-covered GaAs photocathodes



Applied Optics 51(31): 7662-7667



By calculating the energy distributions of electrons reaching the photocathode surface and solving the Schrödinger equation for an electron tunneling through the surface potential barrier, we have obtained an equation to calculate the energy distributions of electrons emitted from reflection-mode Cs-covered GaAs photocathodes based on a two-minima diffusion model. According to the equation, we studied the effects of incident photon energies, diffusion lengths, and surface potential barrier on the electron energy distributions. The equation was also used to fit the measured electron energy distribution curves and the cathode performance parameters were obtained from the fitting. The Γ and L peaks in the theoretical curves are in agreement with the peaks in the experimental curves. The fitted barrier thickness 1.7 Å exactly reflects the GaAs-Cs dipole layer thickness.

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Accession: 052976549

Download citation: RISBibTeXText

PMID: 23128717

DOI: 10.1364/ao.51.007662


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