Directional Auger and directional elastic peak electron spectroscopies: experimental and theoretical approach

The incident electron beam effects for energies 0.5-2keV, measured by Auger and elastically backscattered electrons, were investigated experimentally and theoretically for the (0 0 1), (1 1 1), and (1 1 0) Cu crystals. The Au ger signal and the height of the elastic peak were measured as a function o f the incident angle of the primary beam with the use of an retarding field analyser (RFA). Very well distinguished intensity maxima were found for in cident angles corresponding to the closely packed rows of atoms. The experi mental results correspond to the theoretical data where single scattering c luster (SSC) approximation was used. The damping of Auger and elastically b ackscattered electrons in the sample caused the inclination of the profiles towards the grazing angles. The best correspondence between theory and exp eriment was found for the primary beam energies in the range 1.0-1.3 keV. ( C) 1999 Elsevier Science Ltd. All rights reserved.