Determination of a correction factor for the interaction potential of He+ ions backscattered from a Cu(1 0 0) surface
- 作者：M. Draxler ; M. Walker and C.F. McConville
- 关键词：Interaction potential ; ISS ; Computer simulations ; Surface structure analysis ; Cu(1 0 0)
- 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
- 出版年：2006
- 期刊代码：42_0168583x
- 类别：ph
- 出版时间：August 2006
- 卷：249
- 期：1-2
- 页码：812-815
- 文件大小：340 K
摘要
We have used coaxial impact collision ion scattering spectroscopy (CAICISS) data collected from 3 keV He+ ions backscattered from a Cu(1 0 0) surface in different azimuthal orientations to investigate the influence of the screening length on CAICISS polar angle scans. We have compared the experimental data to computer simulations generated with the FAN code and found that for our experimental conditions an exceptionally low value of 0.53 was required for the correction factor to the Firsov screening length used with the Thomas–Fermi–Moliere potential. In addition we found that the Ziegler–Biersack–Littmark potential is not applicable, resulting in incorrect peak positions in the CAICISS polar angle plots.