BREAKDOWN OF THE FORWARD SCATTERING MODEL IN MgO(001)

A. Chassé (), L. Niebergall, P. Rennert, I. Uhlig and T. Chassé
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A. Chassé: Department of Physics, Martin Luther University, D-06099 Halle, Germany
L. Niebergall: Department of Physics, Martin Luther University, D-06099 Halle, Germany
P. Rennert: Department of Physics, Martin Luther University, D-06099 Halle, Germany
I. Uhlig: Institute of Physical and Theoretical Chemistry, University of Leipzig, D-04103 Leipzig, Germany
T. Chassé: Institute of Physical and Theoretical Chemistry, University of Leipzig, D-04103 Leipzig, Germany

Surface Review and Letters (SRL), 1999, vol. 06, issue 06, 1207-1214

Abstract: Typically, enhanced intensities are observed along low-index crystallographic directions of the crystal when Auger or photoelectrons with a kinetic energy of several hundred eV or more are emitted from atoms in a solid. This effect is a result of strong forward scattering of emitted electrons by overlying lattice atoms. Contrary to this image, a strong dip along the [110] direction has been found in the angular distribution curve of O-KLL Auger electrons of the MgO(001) surface, even though the kinetic energy of O-KLL Auger electrons is about 500 eV. The angular dependence of Auger (O-KLL, Mg-KLL) and photoelectrons (O1s) in MgO(001) is discussed and explained within a multiple scattering cluster model, respectively.

Date: 1999
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DOI: 10.1142/S0218625X99001359

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