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Journal of Applied Physics / Volume 102 / Issue 7 / INTERDISCIPLINARY AND GENERAL PHYSICS

J. Appl. Phys. 102, 074902 (2007); http://dx.doi.org/10.1063/1.2786028 (19 pages)

Photoemission from metals and cesiated surfaces

Kevin L. Jensen1, N. A. Moody2, D. W. Feldman3, E. J. Montgomery3, and P. G. O’Shea3

1Code 6843, ESTD, Naval Research Laboratory, Washington, DC 20375, USA
2Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
3University of Maryland, College Park, Maryland, 20742, USA

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(Received 16 May 2007; accepted 8 August 2007; published online 2 October 2007)

A model of photoemission from coated surfaces is significantly modified by first providing a better account of the electron scattering relaxation time that is used throughout the theory, and second by implementing a distribution function based approach (“Moments”) to the emission probability. The latter allows for the evaluation of the emittance and brightness of the electron beam at the photocathode surface. Differences with the Fowler-Dubridge model are discussed. The impact of the scattering model and the Moments approach on the estimation of quantum efficiency from metal surfaces, either bare or partially covered with cesium, are compared to experiment. The estimation of emittance and brightness is made for typical conditions, and the derivation of their asymptotic limits is given. The adaptation of the models for beam simulation codes is briefly discussed.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. LIMITATIONS OF THE MODIFIED FOWLER-DUBRIDGE MODEL
  3. QUANTUM EFFECTS AND THE TRANSMISSION PROBABILITY
  4. SCATTERING MECHANISMS FOR METALS
    1. Relaxation time approximation
    2. Electron-electron scattering
    3. Electron-phonon scattering
    4. Residual resistivity and the total relaxation time
  5. THE MOMENTS-BASED EMISSION MODEL
    1. Formulation
    2. Emittance and brightness
    3. The Moments approach to the emittance of a photocathode
  6. COMPARISON BETWEEN THEORY AND EXPERIMENT
    1. Complications
    2. The quantum efficiency of bare metals
    3. The quantum efficiency of cesiated surfaces
    4. Emittance and brightness
  7. CONCLUSION

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KEYWORDS and PACS

Keywords

caesium, coatings, electron-phonon interactions, photocathodes, photoemission

PACS

  • 79.60.Bm

    Clean metal, semiconductor, and insulator surfaces

  • 81.65.-b

    Surface treatments

  • 63.20.K-

    Phonon interactions

  • 71.38.-k

    Polarons and electron-phonon interactions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2786028

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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