Abstract
The substitutional surface alloy phases and have been investigated by medium-energy ion scattering (MEIS) using 100 keV ions. Blocking patterns in the scattered ion yield have been measured for and incidence geometries. Simulations of these blocking patterns have been performed for a range of trial structures and the optimum values of the structural parameters obtained are compared with those available from earlier low-energy electron diffraction (LEED) and photoelectron diffraction (PhD) investigations. The MEIS results confirm the presence of rumpling in the outermost alloy layer, with corrugation amplitudes of and for the CuMn and CuAu surface alloys respectively. This result supports the previously reported anomalously large corrugation for which has been attributed to the local high-spin state of the Mn atoms.
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