Abstract
A photoemission study of the W(100)-(5 × 1)C carburized tungsten surface, performed in the photon energy range 65 ⩽ hν ⩽ 200 eV, is reported. Comparison with W(100) and WC(0001) spectra permit detailing of changes in electronic structure upon carburization, as well as identification of primarily C 2s, C 2p, and W 5d-derived regions of the valence band. A separate band forms at −12.2 eV of states essentially pure C 2s in character. States in the upper valence band, particularly near E F, have more W 5d character, while those in the lower valence band have more C 2p character. Structures are altered within the valence band upon carburization, including a significant decrease in emission near E F. Detailed comparison with WC(0001) spectra reveal many similarities: similar binding energies of structures, similar C 2s band, and similar variation of normalized valence band area with hν.
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