impact-collision ion scattering spectroscopy;
silicon;
bismuth;
surface structure;
D O I:
10.1016/S0169-4332(03)00115-6
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
We have investigated the structure of Bi-adsorbed Si(I 0 0) 2 x n surfaces with various Bi coverages by low-energy. electron diffraction (LEED) and impact-collision ion scattering spectroscopy (ICISS). Intensities of He+ scattered from Bi and Si atoms were measured as a function of ion incidence angle. Bi-Bi interatomic distances for the toplayer including Bi-dimers were estimated by the shadow-cone technique. Bi-signal peaks appeared even at considerably large angles of incidence, which are attributed to collisions with Bi atoms in sub-surface layers. Bi adsorption is not completed at a mono-layer level, but continues to form multiple layers, fitted in the Si lattice, in the Frank-van der Merwe growth mode. (C) 2003 Published by Elsevier Science B.V.