Core-level shifts for two- and three-dimensional bimetallic Pdx Cu1-x and Pdx Ag1-x alloys on Ru(0001)
2005 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 72, no 7Article in journal (Refereed) Published
Core-level binding energy shifts (CLSs) and surface CLS (SCLSs) are determined by experiment and theory for ultrathin Pd as well as for PdCu and PdAg surface alloys which vary in thickness from 1 to 4 monolayers (MLs), supported on Ru(0001). Experimentally, the binding energies of Pd and Ag 3 d5 2 are measured by photoelectron spectroscopy using synchrotron radiation, and in the case of Cu 2 p3 2 by x rays (XPS) from a Mg Ka radiation source. The calculations are based on first-principles techniques together with the complete screening picture, including initial and final state effects directly in the same scheme. Dimensional as well as temperature effects are observed and reproduced theoretically, with a good agreement between the calculated CLS and the experimentally observed values. Further it is demonstrated how the layer composition profile of a 4 ML thick PdAg film can be followed by comparing theoretical layer specific CLSs with the measured ones and combine this with the observed intensities of the Ag 3 d5 2 photoelectrons. © 2005 The American Physical Society.
Place, publisher, year, edition, pages
2005. Vol. 72, no 7
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-50439DOI: 10.1103/PhysRevB.72.075444OAI: oai:DiVA.org:liu-50439DiVA: diva2:271335