Abstract

The adsorption of adatom S on the unreconstructed Ir(1 0 0) surface is studied using projector-augmented-wave method based on density-functional theory. It is confirmed that S energetically favors the fourfold hollow site for both the p(2 × 2) and c(2 × 2) phases. The optimized geometries are in reasonable agreement with the LEED results. Also, vibrational frequencies, work-function change and density of states are presented for adatom S in the hollow site.

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