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CHEMISORPTION GEOMETRY OF c(2x2)S/Mo(001) DETERMINED WITH ANGLE-RESOLVED PHOTOEMISSION EXTENDED FINE STRUCTURE

We report the chemisorption geometry for c(2X2)S/Mo(001), as determined using angle-resolved photoemission extended fine-structure (ARPEFS). Sulfur is bonded as expected to the fourfold hollow sites, with a S-Mo bond distance of 2.41(2)A. The Mo first-to-second layer spacing is within 0.03A of the bulk spacing and the second Mo layer is planar within 0.03A. We determined the adsorption geometry of sulfur by fitting ARPEFS curves with a multiple-scattering spherical-wave theory, which provided good agreement with the data.