Abstract
A low-energy electron diffraction (LEED) study of $\mathrm{Pd}(111)\ensuremath{-}(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}\ensuremath{-}\mathrm{Xe}$ at 77 K indicates that the Xe adsorption site is on top of the Pd atoms. The Xe--Pd bond length is $3.07\AA{}\ifmmode\pm\else\textpm\fi{}0.06\AA{}.$ The substrate structure is essentially unrelaxed from the bulk structure. These results contrast with an earlier spin-polarized LEED study, which indicated that hollow sites are occupied in this structure. The low-coordination-site geometry for Xe on Pd(111) is discussed in the context of earlier experimental studies and recent density functional theory results for Xe adsorption on metal surfaces.
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