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Abstract
The surface structure and stoichiometry of the substitutionally disordered alloy MoxRe1−x(100) were determined by quantitative LEED I(E) analyses for bulk concentrations of x=0.75, 0.85 and 0.95. Diffraction intensities were measured and analysed for electron energies up to 600 eV in order to also access values of the physical parameters of deeper layers. An excellent theory-experiment agreement, together with a large data base for each bulk stoichiometry, allow the accurate detection of rather strong oscillatory interlayer relaxations. They extend unusually deep into the bulk, i.e. down to the sixth layer. Additionally, a “sandwich segregation” with Mo termination of the surface and Re enrichment in the second layer is found, which is held responsible for the deeper interlayer relaxations.
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