Surface extended x-ray-absorption fine-structure study of the (1 monolayer Sb)/GaP(110) interface.

Abstract

Sb L-edge absorption fine structure has been measured to study the bonding geometry of the (1 monolayer Sb)/GaP(110) interface. The polarization dependence of these measurements confirms that the Sb zigzag chains lie nearly parallel to the GaP surface. The Sb-P, Sb-Ga, and Sb-Sb bond lengths are determined to be 2.60\ifmmode\pm\else\textpm\fi{}0.05, 2.79\ifmmode\pm\else\textpm\fi{}0.05, and 2.88\ifmmode\pm\else\textpm\fi{}0.05 \AA{}, respectively. These values are better characterized by sums of covalent radii than by bond lengths determined in total-energy-minimization calculations.