We calculate the difference of the ionization energies of a core electron of a surface alloy, i.e., a B atom in a A(1-x)B(x) overlayer on a fee B(001) substrate, and a core electron of the clean fee B(001) surface using density-functional theory. We analyze the initial-state contributions and the screening effects induced by the core hole, and study the influence of the alloy composition for a number of noble metal-transition metal systems. Our analysis clearly indicates the importance of final-state screening effects for the interpretation of measured core-level shifts. Calculated deviations from the initial-state trends are explained in terms of the change of inter- and intra-atomic screening upon alloying. A possible role of alloying on the chemical reactivity of metal surfaces is discussed.
Bibliographical noteCopyright (1997) American Physical Society.
- BINDING-ENERGY SHIFTS
Ganduglia-Pirovano, M. V., Kudrnovský, J., & Scheffler, M. (1997). Adlayer Core-Level Shifts of Random Metal Overlayers on Transition-Metal Substrates. Physical Review Letters, 78(9), 1807-1810. https://doi.org/10.1103/PhysRevLett.78.1807