Unoccupied electronic states of Au(113): Theory and experiment

We present results from inverse photoemission spectroscopy in the isochromat mode, with angular resolution, from a clean Au(113) surface. To identify the origin of the different resonances, we have performed a first-principles calculation of the bulk band structure in the linear-muffin-tin-orbital formalism. We predict the dispersion of the bulk features, as a function of parallel momentum, considering energy and momentum conservation. We have been able to identify unambiguously two surface resonances and a surface state in the [{bar 1}10] and [33{bar 2}] directions, respectively, as well as various bulk-derived features.