Photoelectron angular distributions of Cu,Ag, Pt and Au samples: experiments and simulations |
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| Authors: | G Tasneem C Tomastik S Gerhold W S M Werner W Smekal C J Powell |
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| Institution: | 1. Institut für Angewandte Physik, Vienna University of Technology, Wiedner Hauptstrasse 8‐10, A‐1040 Vienna, Austria;2. Austrian Centre of Competence for Tribology, Viktor Kaplan‐Stra?e 2, A‐2700 Wiener Neustadt, Austria;3. Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20899‐8370, USA |
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| Abstract: | Angular distributions of photoelectrons emitted from semi‐infinite Cu, Ag, Pt and Au specimens have been measured for off‐normal emission angles in the range between 20 and 70° with a Thermo Theta Probe electron spectrometer. Experimental peak intensities for peaks of atomic subshells observable in the spectra were compared with results of simulations using the NIST Database for the Simulation of Electron Spectra for Surface Analysis (SESSA) that takes into account the effects of (i) anisotropy of the photoelectric cross‐section; (ii) elastic scattering of the photoelectrons; and (iii) the finite solid angle of the detector. In addition, a separate correction was made to the simulated intensities for the effects of surface excitations. The combined influence of these effects was found to significantly affect the angular distributions. Furthermore, it was found that ratios of the calculated peak intensities of the observed subshells for a particular material to the measured intensities deviate from unity by typically less than 1% after corrections for multiple inelastic scattering and surface excitations. Copyright © 2010 John Wiley & Sons, Ltd. |
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| Keywords: | ARXPS anisotropy elastic scattering surface excitations |
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