Abstract
A systematic analysis of the embedded atom EXAFS (AXAFS) effectis presented. This effect is explained by the backscattering of thephotoelectron at interstitial charge densities. The reconstructed (2 × 1)O/Cu(110)system is an ideal prototype system in which to study the angular dependence ofthe AXAFS because oxygen–copper rows are formed resulting in a C2symmetry. The scattering potential is non-spherical because of the highdirectionality of the O–Cu bonds. The high signal-to-noise ratio of theexperimental data enables us to clearly identify the AXAFS contribution. Here wepresent the definite angular dependence of the experimental AXAFS for the firsttime, giving a unique opportunity to measure the anisotropy of the localembedded atom potential. The angular dependence demonstrates that theAXAFS effect cannot be mimicked by multi-electron excitations or experimentalartifacts for this system. We compare our experiments to theoretical calculationswithin the muffin-tin approximation and show that future full-potentialcalculations are needed to model the angular dependence determined.
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