Abstract
The 1s level soft X-ray appearance potential spectra of C, N, O, and S adsorbed on polycrystalline 3d transition metal surfaces (e.g. Ti, Cr, Fe, and Ni) are presented. In the chemisorption regime of adsorption the adsorbate Is level spectra are characterized by a single peak above the excitation threshold. The peak is thought to be related to an enhanced local density of unfilled valence states on the adatoms. The peak widths correlate with the widths of the unfilled portion of substrate d-band in a way consistent with a mixing of the adsorbate valence states and the substrate d-states.
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