An asymptotic approximation of multiple-scattering theory in very-low-energy electron diffraction from a metal surface |
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Authors: | G V Vol’f Yu P Chuburin D V Fedorov V N Strocov |
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Institution: | 1. Physicotechnical Institute, Ural Division, Russian Academy of Sciences, 426001, Izhevsk, Russia 2. Department of Physics, Chalmers University of Technology and G?teborg University, S-41296, G?teborg, Sweden 3. Institute of High-Speed Computations and Databases, Russian Academy of Sciences, 194291, St. Petersburg, Russia
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Abstract: | An asymptotic approximation of multiple-scattering theory has been used to analyze the intensity of very-low-energy-electron
diffraction (VLEED). An analytic expression relating the amplitudes of the Bloch waves excited in a crystal (and, hence, the
VLEED intensities) to the critical zone points of an infinite crystal has been obtained. The possibilities of the new approach
are compared with a calculation of partial electron-transmission coefficients made by the matching method employed conventionally
in interpretation of VLEED data. While providing a comparable accuracy, the proposed approach is fairly simple and free of
the instabilities inherent in matching-method calculations. The explicit connection of the quantities obtained by this method
with the electron dispersion relation for an infinite crystal makes it promising for analysis of band-structure effects in
VLEED and photoemission experiments.
Fiz. Tverd. Tela (St. Petersburg) 41, 2105–2108 (December 1999) |
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