Publications in Scientific Journals:

W.S.M. Werner, W. Smekal, T. Hisch, J. Himmelsbach, C.J. Powell:
"Simulation of Electron Spectra for Surface Analysis (SESSA) for quantitative interpretation of (hard) X-ray photoelectron spectra (HAXPES)";
Journal of Electron Spectroscopy and Related Phenomena, 190 (2013), 137 - 143.

English abstract:
For the interpretation of photoelectron spectra and in order to obtain quantitative information on the
chemical structure of surfaces, one commonly makes a number of simplifying assumptions concerning
the generation of the signal electrons, such as the neglect of photoelectron elastic scattering, and the
anisotropy of photoelectron emission. While the effects of these assumptions for planar surfaces and
for conventional X-ray sources has been investigated in detail in the past, the combined influence of
the nanomorphology, the polarisation of the incoming beam and other processes playing a role in the
photoelectron escape on the angular- and energy-distribution of emitted photoelectrons has not been
clarified to date. The National Institute of Standards and Technology (NIST) Database for the Simulation
of Electron Spectra for Surface Analysis (SESSA) is a unique tool for interpretation of experimental data
for nanostructured surfaces as well as for experimental design with photoelectron energies between
50 eV and 30 keV. SESSA has recently been modified to allow a user to simulate X-ray photoelectron
spectroscopy (XPS) spectra of nanostructured surfaces, such as surfaces covered with rectangular islands,
nanowires, pyramids, spheres, and layered spheres. The effect of the nanomorphology on the emitted
angular and energy distribution of photoelectrons is investigated and comparison is made of simulated
data with experimental results. Finally, the full potential of XPS for characterising nanostructures by
a consistent analysis of the angular distribution of both the photoelectron peaks and their associated
inelastic loss features is explored.

Photoelectron spectra Electron transport Nanomorphology Nanostructures

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