Quantitative studies of metal-metal adhesion and interface segregation energies using photoelectron spectroscopy

Abstract
Layer-dependent core-level shifts have been studied for Yb epitaxially grown on Mo(110). Clearly resolved Yb 4f positions are simultaneously distinguished for the interface, the free Yb surface, and the intermediate layers. The measured shifts provide new and detailed quantitative information on the energetics of adhesion and interface segregation; this type of data is otherwise most difficult to obtain. The determined energies are in good agreement with results from semiempirical calculations.