Photoionization Line Shape of the Surface State on W(100)

Abstract
Surface-state photoemission from W(100) is observed for photon energies up to 40.8 eV, contrary to previous measurements. The linewidth of this feature shows an excitation-energy dependence, which extrapolates to the field-emission value. Asymmetric broadening occurs at higher photon energies and is interpreted in terms of many-body effects associated with a heavy-hole state, implying a relaxation shift of the energetic position of the surface state.

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