Evidence for unnatural-parity contributions to electron-impact ionization of laser-aligned atoms
Evidence for unnatural-parity contributions to electron-impact ionization of laser-aligned atoms
复制标题
激光排列原子电子轰击电离的非自然宇称贡献的证据
DOI：
10.1103/physreva.92.032706
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发表时间：
2015
影响因子：
2.9
通讯作者：
Armstrong G
中科院分区：
文献类型：
--
作者：
Armstrong G
最近的测量研究了激发态激光对准镁原子的电子碰撞电离。在这项工作中，我们表明，所产生的电离截面的几何形状，其中对齐的原子是垂直于散射平面直接探测电离振幅的非自然奇偶性的贡献。自然宇称分波的贡献在这种几何中完全抵消。我们的计算解决了在这个平面上的非零测量横截面和零横截面预测的扭曲波的方法之间的差异。我们证明，这是一个一般的功能，从状态的目标电离从激发的Ca和Na原子的电离的额外研究。
Recent measurements have examined the electron-impact ionization of excited-state laser-aligned Mg atoms. In this work we show that the ionization cross section arising from the geometry where the aligned atom is perpendicular to the scattering plane directly probes the unnatural parity contributions to the ionization amplitude. The contributions from natural parity partial waves cancel exactly in this geometry. Our calculations resolve the discrepancy between the nonzero measured cross sections in this plane and the zero cross section predicted by distorted-wave approaches. We demonstrate that this is a general feature of ionization from-state targets by additional studies of ionization from excited Ca and Na atoms.