Insensitivity to the long-range Coulomb potential in laser-induced elastic scattering of electrons with ions
Insensitivity to the long-range Coulomb potential in laser-induced elastic scattering of electrons with ions
复制标题
激光诱导电子与离子的弹性散射对长程库仑势不敏感
DOI：
10.1103/physreva.88.065402
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发表时间：
2013-12
影响因子：
2.9
通讯作者：
Xiaohong Song
中科院分区：
文献类型：
--
作者：
Zhangjin Chen;Junliang Xu;Weifeng Yang;Xiaohong Song
最近，Blagaet 等人使用激光诱导电子衍射以亚埃精度和几飞秒的曝光时间对分子结构进行成像。[Nature (London) 483, 194 (2012)0028-0836NATUAS10.1038/nature10820]，他们在计算分子对电子的弹性散射的微分截面 (DCS) 时将分子离子视为中性分子离子。在这项工作中，我们研究了电子与离子和原子弹性散射的长程和短程势效应。研究发现，对于入射电子能量高于 100 eV 且散射角大于 40 的情况，长程库仑势散射的 DCS 可以忽略不计，而电子与原子离子和中性原子的弹性散射的 DCS 非常吻合。因此，Blagaet 等人的治疗方法的有效性得到了验证。
Recently, laser-induced electron diffraction has been used to image molecular structures with subangstrom precision and exposure times of a few femtoseconds by Blagaet al.[Nature (London) 483, 194 (2012)0028-0836NATUAS10.1038/nature10820], who treated molecular ions as neutral molecules in the calculation of differential cross section (DCS) for elastic scattering of electrons by molecular ions. In this work, we investigate the long-range and short-range potential effects in elastic scattering of electrons with ions and atoms. It has been found that for incident electron energies above 100 eV and scattering angles greater than 40, the DCSs of long-range Coulomb potential scattering can be neglected and the DCSs for elastic scattering of electrons with atomic ions and neutral atoms agree well. Therefore, the validity of the treatment in Blagaet al.is verified.