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arXiv 2303.03216physics.atom-ph
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CH4和NH3分子的扭曲电子碰撞电离动力学

Dynamics of twisted electron impact ionization of CH4 and NH3 molecule

Nikita Dhankhar, Neha, R. Choubisa

摘要:

电子涡旋束(EVB,也称为扭曲电子束)相对于其传播方向具有内禀轨道角动量(OAM)。这种内在的OAM代表了一种新的自由度,为研究电子碰撞电离的动力学提供了新的见解。在本文中,我们提出,在第一玻恩近似(FBA),在共面非对称几何结构中的CH4和NH3分子靶的(e,2e)过程的三重微分截面(TDCS)的角分布。我们比较了不同OAM数m值的EVB与平面波的TDCS。在更现实的情况下,我们研究了宏观目标的平均TDCS,以探讨扭曲电子束的张角θp对TDCS的影响。此外,我们还提出了两个EVB相干叠加的TDCS。结果表明,扭曲的(e,2e)过程恢复的p型字符的分子轨道,这是缺乏在平面波TDCS给定的运动学。两束贝塞尔光束相干叠加的结果表明了TDCS对OAM数m的敏感性。

英文摘要:

Electron vortex beams (EVB, also known as twisted electron beams) possess an intrinsic orbital angular momentum (OAM) with respect to their propagation direction. This intrinsic OAM represents a new degree of freedom that provides new insights into investigating the dynamics of electron impact ionization. In this communication, we present, in the first-Born approximation (FBA), the angular profiles of the triple differential cross-section (TDCS) for the (e, 2e) process on CH4 and NH3 molecular targets in the coplanar asymmetric geometry. We compare the TDCS of the EVB for different values of OAM number m with that of the plane wave. For a more realistic scenario, we investigate the average TDCS for macroscopic targets to explore the influence of the opening angle θp of the twisted electron beam on the TDCS. In addition, we also present the TDCS for the coherent superposition of two EVBs. The results demonstrate that the twisted (e, 2e) process retrieves the p-type character of the molecular orbitals, which is absent in the plane wave TDCS for the given kinematics. The results for the coherent superposition of two Bessel beams show the sensitivity of TDCS towards the OAM number m.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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