We present results from Inverse photoemission spectroscopy in the isochromat mode, with angular resolution, from the clean Au(113) surface. To identify the origin of the different resonances we have performed first principles calculations of the bulk band structure in the LMTO formalism. Using the particular characteristic of the spectrometer we have made a theoretical prediction of the bulk features dispersion as a function of parallel momentum, considering only energy and momentum conservation. Thus we have been able to unambiguously identify, from measured spectra various bulk derived resonances in addition to two surface resonances and a surface state in the [-110] and [33-2] directions respectively.
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