Projectile transverse momentum controls emission in electron vortex ionization collisions
Projectile transverse momentum controls emission in electron vortex ionization collisions
复制标题
DOI：
10.1088/1361-6455/abb3ac
复制
发表时间：
2020-07
期刊：
影响因子：
--
通讯作者：
A. Plumadore;A. Harris
中科院分区：
文献类型：
--
作者：
A. Plumadore;A. Harris
在过去的十年中，电子涡旋（EV）束的实现导致了从电子显微镜到单个分子的控制和操纵等领域的许多拟议应用。然而，尽管EV光束具有许多独特的特性和有前途的优势，如横向动量和量子化轨道角动量，但对它们在原子尺度上与物质的基本相互作用的理解仍然有限。EV射弹和原子目标之间的碰撞可以提供一些洞察这些相互作用，我们在这里提出了全微分截面（FDCS）的激发态原子氢目标使用EV射弹电离。我们表明，弹丸的横向动量导致的电离电子的角分布被改变相比，非涡流弹丸和电离电子的喷射角可以通过调整的涡流开口角，独特的涡流弹丸的功能来控制。此外，在弹丸的动量转移的固有的不确定性，导致经典的二元峰加宽，使目标电子密度的签名更容易观察。用于对准的2p靶展示结构的FDCS可用于确定对准。
The realization of electron vortex (EV) beams in the past decade has led to numerous proposed applications in fields from electron microscopy to control and manipulation of individual molecules. Yet despite the many unique characteristics and promising advantages of EV beams, such as transverse momentum and quantized orbital angular momentum, there remains a limited understanding of their fundamental interactions with matter at the atomic scale. Collisions between EV projectiles and atomic targets can provide some insight into these interactions and we present here fully differential cross sections (FDCS) for ionization of excited state atomic hydrogen targets using EV projectiles. We show that the projectile’s transverse momentum causes the ionized electron angular distributions to be altered compared to non-vortex projectiles and that the ionized electron’s ejection angle can be controlled by adjustment of the vortex opening angle, a feature unique to vortex projectiles. Additionally, an inherent uncertainty in the projectile’s momentum transfer leads to a broadening of the classical binary peak, making signatures of the target electron density more readily observable. FDCS for aligned 2p targets exhibit structures can be used to determine the alignment.