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Non-dipole effects in photoelectron-monitored X-ray standing wave experiments: characterisation and calibration
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UNSPECIFIED (2001) Non-dipole effects in photoelectron-monitored X-ray standing wave experiments: characterisation and calibration. Surface Science, 494 (3). pp. 166-182. ISSN 0039-6028.
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Abstract
The results are reported of a series of experiments designed to characterise and calibrate the role of non-dipolar (notably electric quadrupole-dipole interference) effects in the angular distribution of photoelectron emission on structural studies of surfaces using normal incidence X-ray standing wavefield absorption. The values of the resulting backward/forward asymmetry parameter (relative to the photon propagation direction) have been measured for Is emission at photon energies around 3 keV for first and second row elements from C to Cl. and are compared with recent theoretical determinations. The influence of additional non-dipole interference terms in the coherent X-ray standing wave has also been determined for the case of Al Ls emission and found to be weak. typically introducing systematic errors in atomic positions of only around 0.02-0.04 Angstrom. (C) 2001 Elsevier Science B.V. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Journal or Publication Title: | Surface Science | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0039-6028 | ||||
Official Date: | 1 December 2001 | ||||
Dates: |
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Volume: | 494 | ||||
Number: | 3 | ||||
Number of Pages: | 17 | ||||
Page Range: | pp. 166-182 | ||||
Publication Status: | Published |
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