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Modeling Valence-Band Images from Synchrotron-Radiation Studies Using Display Analyzers: Lithium Fluoride and Graphite

Published online by Cambridge University Press:  15 February 2011

Eric L. Shirley,
Louis J. Terminello,
John E. Klepeis and
F. J. Himpsel
John E. Klepeis
Affiliation:
Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, CA 94551
F. J. Himpsel
Affiliation:
I. B. M. Research Division, Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, NY 10598
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Abstract

We present simulated photoelectron angular distributions (PAD's) for LiF and graphite. The results describe electron photocurrent versus photon energy, electron initial-state energy, and emission angles (leading to identification of two, or three, components of a valence electron's initial crystal momentum). Results are displayed in a fashion greatly facilitated by display analyzers. Earlier experimental results for LiF are confirmed in great detail. We discuss statistical comparison of theoretical and experimental PAD's. Effects of Bragg- diffraction on outgoing photoelectrons and uncertainty in crystal momentum normal to a surface are analyzed. In graphite, the observed lowering of symmetry, from that in a periodic-zone band structure to that seen in the PAD's, is modeled and explained.

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References

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