Influence of octupole photoionization transitions on the angular distribution of photoelectrons from solids with account for elastic scattering |
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| Affiliation: | 1. Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK;2. EastCHEM School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, UK;1. Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, Qingdao University of Science and Technology, 266042, PR China;2. School of Polymer Science and Engineering, Qingdao University of Science and Technology, 266042, PR China |
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| Abstract: | Using the transport theory approach, equations are derived for the angular dependence of XPS intensities from semi-infinite solids taking into account elastic scattering of photoelectrons and non-dipolar transitions up the second-order corrections. The unpolarized excitation source is considered. The elastic scattering is the main term smearing the non-dipolar contribution in complete analogy with smearing of dipole contribution. Some additional terms are shown to be negligible in comparison with the main term for complete sets of emission and azimuth angles, three representative single scattering albedo values and several representative sets of the second-order non-dipolar parameters. The photoelectron angular distributions are calculated for Al 2s and Ag 3d lines using transport theory and Monte-Carlo simulation. The Monte-Carlo calculations are in agreement with transport theory approach. |
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