X-ray photoelectron spectroscopy of low surface concentration mass-selected Ag clusters

摘要

We have d eveloped an experimental setup for the study of small mass-selected clusters delivered by soft landing to a model oxide support. An automated deposition system to acheieve accurately soft landing to a model oxide support. An automated depositioj system to achieve accurately quantified homogeneous surfaces is described which also overcomes beam instability. Finally we present some recent photoelectron spectroscopic data from the analysis of mass-selected Ag~+_n clusters deposited on a Xe covered Al_2O_3 surface. Large core-level binding energ dhifts are observed as a function of deposited cluster size and diffusion/agglomeration within the noble gas layer