Abstract
Photoemission from the W(001) W 4 f 7 2 core level has been studied as a function of adsorbed atomic sulfur using synchrotron radiation at 71 eV. The W 4 f 7 2 feature associated with the clean surface is rapidly attenuated as the sulfur coverage is increased. Two new peaks resulting from the interaction of surface tungsten with the adsorbed sulfur appear. The binding energy of the shifted surface peaks is related to the increased coordination of the first layer tungsten atoms as they bond to the adsorbate and to a chemical shift induced by the sulfur. The intensities of the surface peaks are correlated with the structure of the sulfur overlayer.
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