Publications in Scientific Journals:

G. Tasneem, C. Tomastik, S. Gerhold, W.S.M. Werner, W. Smekal, C.J. Powell:
"Photoelectron angular distributions of Cu, Ag, Pt and Au samples: experiments and simulations";
Surface and Interface Analysis, 43 (2010), 6; 934 - 939.

English 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.

ARXPS; anisotropy; elastic scattering; surface excitations

Created from the Publication Database of the Vienna University of Technology.