A comparative study of interference effects in (e, 2e) electron momentum profiles of CO2, ethylene and 1,3-butadiene
A comparative study of interference effects in (e, 2e) electron momentum profiles of CO2, ethylene and 1,3-butadiene
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DOI：
10.1088/1361-6455/ab19f3
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
Isao Nakajima;M. Yamazaki;M. Takahashi
中科院分区：
文献类型：
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作者：
Isao Nakajima;M. Yamazaki;M. Takahashi
本文报道了CO2、乙烯和1，3-丁二烯最外层轨道球平均电子动量密度分布的干涉效应的比较研究。在对称的非共面几何结构中，在入射电子能量为1.2 keV的情况下，对三个分子轨道进行了实验，每个分子轨道由2 p原子轨道组成。然后，通过将实验数据除以通过使用扭曲波脉冲近似计算的2 p原子轨道的（e，2 e）截面，获得每个分子轨道的干涉图案。它清楚地表明，干涉图案告诉建设性或破坏性的组成2 p原子轨道之间的重叠的性质。此外，它表明，更高的仪器动量分辨率将需要详细的研究干涉效应的情况下，当两个组成原子轨道具有较大的空间分离都垂直于分子轴或平面。
We report a comparative (e, 2e) study of intereference effects in the spherically-averaged electron momentum density distributions of the outermost orbitals of CO2, ethylene and 1,3-butadiene. The experiments on the three molecular orbitals, being each composed of 2p atomic orbitals, were performed in the symmetric noncoplanar geometry and at an incident electron energy of 1.2 keV. Interference patterns have then been obtained for each molecular orbital by dividing the experimental data by (e, 2e) cross section of a 2p atomic orbital calculated by using distorted wave impulse approximation. It is clearly demonstrated that interference patterns tell about constructive or destructive nature of the overlap between the constituent 2p atomic orbitals. Furthermore, it is shown that higher instrumental momentum resolution would be required for detailed studies on interference effects in cases when two of the constituent atomic orbitals with larger spatial separation are both oriented perpendicular to the molecular axis or plane.