H- and O-induced compressive surface stress on Pt(111): Experiments and density functional theory calculations (original) (raw)

Surface-stress changes induced by the adsorption of oxygen and hydrogen on clean Pt͑111͒ are measured at 320 K under UHV conditions with an optical crystal curvature method and are calculated using densityfunctional theory. A compressive surface-stress change is measured upon exposure of Pt͑111͒ to either H 2 or O 2. The magnitude of the adsorbate-induced surface-stress change is in quantitative agreement with our calculations. Our results indicate that both electropositive ͑H͒ and electronegative ͑O͒ adsorbates may induce a compressive surface-stress change. The significance of these results for the understanding of adsorbateinduced surface stress is discussed.