水分子扭曲电子碰撞电离的三重微分截面
Triple differential cross-section for the twisted electron impact ionization of water molecule
摘要：
本文给出了平面波和扭曲电子束作用下H_2O分子（e，2 e）过程的三重微分截面（TDCS）结果。形式主义是在第一玻恩近似。我们分别描述了入射电子、散射电子、H_2O分子态和射出电子的平面波/扭曲波、平面波、原子轨道线性组合（LCAO）（自洽场LCAO方法）和库仑波。我们研究了水分子外轨道1B 1，3A 1，1B 2和2A 1的TDCS的角分布。我们比较了扭转电子束和平面波电子束在不同轨道角动量m值下的TDCS角分布。我们还研究了宏观H_2O靶的TDCS，探讨了扭曲电子束张角θp对TDCS的影响。我们的结果清楚地显示了扭曲电子的OAM数（m）和张开角θp对水分子TDCS的影响。
英文摘要：
In this communication, we present the results of the triple differential cross-section (TDCS) for the (e,2e) process on H2O molecule for the plane wave and the twisted electron beam impact. The formalism is developed in the first Born approximation. We describe the plane/twisted wave, plane wave, the linear combination of atomic orbitals (LCAO) (self-consistent field LCAO method) and Coulomb wave for the incident electron, scattered electron, the molecular state of H2O, and the ejected electron, respectively. We investigate the angular profiles of the TDCS for the outer orbitals 1B1, 3A1, 1B2, and 2A1 of the water molecule. We compare the angular profiles of the TDCS for the different values of orbital angular momentum (OAM) number m of the twisted electron beam with that of the plane wave beam. We also study the TDCS for macroscopic H2O target to explore the effect of opening angle θp of the twisted electron beam on the TDCS. Our results clearly show the effect of the twisted electron's OAM number (m) and the opening angle θp on the TDCS of the water molecule.
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