Multilayer relaxation of the Fe{210} surface

Abstract

The surface structure of body-centered-cubic Fe{210} has been determined by low-energy-electron-diffraction intensity analysis. Substantial relaxations from bulklike structure in directions both perpendicular and parallel to the surface were found. The {210} surface is the most open of the six Fe surfaces that have been studied, shows the largest perpendicular relaxation, involves the most structural parameters (8), and has been determined to the greatest depth (down to the fifth layer). The observed structure is as follows: spacing between first and second layer d12=0.50±0.03 A (bulk spacing is 0.641 A), in similar notation d23=0.57±0.03 A, d34=0.75±0.03 A, d45=0.61±0.03 A; change of registry shift between first and second layer a12=0.14±0.05 A, in similar notation a23=0.03±0.05 A, a34=0.00±0.05 A, a45 =0.08±0.05 A.. AE © 1985 The American Physical Society.