New method of evaluation for interatomic interaction potential in LEIS with large-angle scattering using the two-atom scattering model
- 作者：Wataru Takeuchi ; Naoki Matsuda
- 关键词：Interatomic potential ; Ion-solid interactions ; Low energy ion scattering (LEIS) ; Two-atom scattering model (TWASM)
- 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
- 出版年：2008
- 期刊代码：42_0168583x
- 类别：ph
- 出版时间：March 2008
- 卷：266
- 期：6
- 页码：877-880
- 文件大小：126 K
摘要
The interaction potential between an incident ion and a target atom in impact-collision ion scattering spectroscopy (ICISS), which is a specialization of low energy ion scattering (LEIS) and its variants, i.e. ICISS with detection of neutrals (NICISS), coaxial ICISS (CAICISS) and impact-collision atom scattering spectroscopy with detection of neutrals (NICASS), has been evaluated by the new method using the dependence of the total scattering angle on the impact parameter for the first collision in the numerical calculations based on the two-atom scattering model (TWASM). From the comparison of determined values of scaling factor for the Firsov screening length by three-dimensional computer simulations with calculated ones by TWASM, it became obviously that the interatomic potentials for the various combinations of an incident ion and a target atom in LEIS are suitably given by the Moliere potential with the reduced Firsov screening length employing the scaling factor obtained in TWASM calculations.