Influence of elastic scattering on the measurement of core-level binding energy dispersion in X-ray photoemission spectroscopy
Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, 1700 Fribourg, Switzerland
2 Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
Corresponding author: a email@example.com
Revised: 9 May 2011
Published online: 22 June 2011
We explore the interplay between the elastic scattering of photoelectrons and the surface core level shifts with regard to the determination of core level binding energies in Au(111) and Cu3Au(100). We find that an artificial shift is created in the binding energies of the Au 4f core levels, that exhibits a dependence on the emission angle, as well as on the spectral intensity of the core level emission itself. Using a simple model, we are able to reproduce the angular dependence of the shift and relate it to the anisotropy in the electron emission from the bulk layers. Our results demonstrate that interpretation of variation of the binding energy of core-levels should be conducted with great care and must take into account the possible influence of artificial shifts induced by elastic scattering.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011