Abstract
The adsorption geometry of CO in the (2\ifmmode\times\else\texttimes\fi{}1)p2mg phase on Pd(110) has been determined by means of an application of high-energy x-ray photoelectron diffraction, which achieves adsorption site sensitivity in a forward scattering geometry. Information about the surface structure is extracted from the azimuthal angle dependence of the surface component of the Pd 3${\mathit{d}}_{5/2}$ photoemission peak. Surface sensitivity is obtained by working at grazing emission angles. The experimental data are compared with single scattering cluster simulations, giving clear evidence that the CO molecules are located in short-bridge sites. The estimated Pd-C distance is 1.86\ifmmode\pm\else\textpm\fi{}0.09 \AA{}. A CO tilt angle of 24\ifmmode\pm\else\textpm\fi{}3\ifmmode^\circ\else\textdegree\fi{} from the surface normal was determined by means of the C 1s polar scan along the plane normal to the [001] direction. \textcopyright{} 1996 The American Physical Society.
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