手性特定电子涡旋束光谱学
Chiral specific electron vortex beam spectroscopy
摘要：
电子涡旋束携带关于传播轴的明确定义的轨道角动量（OAM）。因此，这种光束的特征在于手性特征，这使得它们潜在地用作磁性和其他手性材料的探针。的非弹性过程中，电子涡旋束与原子相互作用，其中涉及OAM交换的分析概述，导致多极选择规则，这种手性特定的电子涡旋束光谱。我们的结果清楚地表明，选择规则依赖于所涉及的原子的动力学状态和位置。在最有利的情况下，这种形式的电子能谱可以诱导磁子能级跃迁，通常使用圆偏振光子束进行探测。
英文摘要：
Electron vortex beams carry well-defined orbital angular momentum (OAM) about the propagation axis. Such beams are thus characterised by chirality features which make them potentially useful as probes of magnetic and other chiral materials. An analysis of the inelastic processes in which electron vortex beams interact with atoms and which involve OAM exchange is outlined, leading to the multipolar selection rules governing this chiral specific electron vortex beam spectroscopy. Our results show clearly that the selection rules are dependent on the dynamical state and location of the atoms involved. In the most favorable scenario, this form of electron spectroscopy can induce magnetic sublevel transitions which are commonly probed using circularly polarized photon beams.
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