Enhanced anharmonicity in the interaction of low-Zadsorbates with metal-surfaces

9 April 1990

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 64 (15) , 1765-1768
https://doi.org/10.1103/physrevlett.64.1765

Abstract

Temperature-dependent surface extended x-ray-absorption fine-structure (SEXAFS) measurements on half a monolayer of O and N atoms on Ni(100) and Cu(100) surfaces indicate enhanced anharmonic contributions in the adsorbate-substrate pair potential, with respect to bulk values. From the temperature dependence of the SEXAFS amplitude and phase we calculate the thermal expansion coefficients. These coefficients are found to be enhanced independent of the system, establishing the observed anharmonicity as a general surface-related property. The implications of these findings for surface reconstructions are discussed.

Keywords

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