Abstract
A surface structural study of the \ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 R30\ifmmode^\circ\else\textdegree\fi{} Cl/Ni(111) adsorbate system was made using low-temperature angle-resolved photoemission extended fine structure. The experiments were performed along two emission directions, [111] and [110], and at two temperatures, 120 and 300 K. The multiple-scattering spherical-wave analysis determined that the Cl atom adsorbs in the fcc threefold hollow site, 1.837(8) \AA{} above the first nickel layer, with a Cl-Ni bond length of 2.332(6) \AA{}, and an approximate 5% contraction between the first and the second nickel layers (the errors in parentheses are statistical standard deviations only).
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