SURFACE-STRUCTURE DETERMINATION OF AU(1 ML) FE(15 ML) AU(100) USING ANGLE-RESOLVED PHOTOEMISSION EXTENDED FINE-STRUCTURE

We have determined the atomic surface structure of a thin film of Fe ( 15 ML) grown On the Au(100) surface, Au(1 ML)/Fe(15 ML)/Au(100), with angle-resolved photoemission extended fine structure (ARPEFS) using th e Au 4f(7/2) core level. We have confirmed that a bcc crystalline Fe f ilm grows epitaxially on the Au(100) substrate with 1 ML or Au atoms r emaining on the surface using angle-resolved photoemission spectroscop y. We analyzed the ARPEFS oscillations using an electron-scattering co de based on the Rehr-Albers scattering matrix formalism. Our analysis finds that the surface Au atoms are positioned in the fourfold hollow sites 1.67 +/- 0.02 Angstrom above the Fe surface. We also find that t he grown Fe layers are very like bulk bcc Fe, with an interlayer spaci ng of 1.43 +/- 0.03 Angstrom.