Chiral photoelectron angular distributions from ionization of achiral atomic and molecular species
Chiral photoelectron angular distributions from ionization of achiral atomic and molecular species
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DOI：
10.1103/physrevresearch.2.033209
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发表时间：
2020-08-06
影响因子：
4.2
通讯作者：
Doerner, Reinhard
中科院分区：
文献类型：
--
作者：
Pier, Andreas;Fehre, Kilian;Doerner, Reinhard
我们表明，两个非手性成分的组合-一个原子或分子的目标加上圆偏振光子-可以产生手性结构的光电子角分布。对于CO的光电离，当分子轴既不垂直于光传播轴，也不（反）平行于光传播轴时，碳K壳层光电子的角分布是手性的。在He的光双电离中，如果一个电子的分布是手性的，则另一个电子在前一种情况下像分子轴一样取向，并且如果电子可以通过它们的能量来区分。在这两种情况下，圆偏振光子定义了一个具有旋转方向的平面，CO分子或一个电子定义了一个额外的轴，这足以建立一个明确的手性坐标系。为了产生手性结构的电子角分布，这样的坐标系是必要的，但不是足够的。我们表明，需要额外的电子-电子相互作用或散射过程来创建手性角分布。
We show that the combination of two achiral components-an atomic or molecular target plus a circularly polarized photon-can yield chirally structured photoelectron angular distributions. For photoionization of CO, the angular distribution of carbon K-shell photoelectrons is chiral when the molecular axis is neither perpendicular nor (anti)parallel to the light propagation axis. In photo-double-ionization of He, the distribution of one electron is chiral if the other electron is oriented like the molecular axis in the former case and if the electrons are distinguishable by their energy. In both scenarios, the circularly polarized photon defines a plane with a sense of rotation and an additional axis is defined by the CO molecule or one electron. This is sufficient to establish an unambiguous coordinate frame of well-defined handedness. To produce a chirally structured electron angular distribution, such a coordinate frame is necessary but not sufficient. We show that additional electron-electron interaction or scattering processes are needed to create the chiral angular distribution.