Triple-differential cross sections for (e, 2e) electron-impact ionization dynamics of tetrahydrofuran at low projectile energy
Triple-differential cross sections for (e, 2e) electron-impact ionization dynamics of tetrahydrofuran at low projectile energy
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低射弹能量下四氢呋喃的 (e, 2e) 电子轰击电离动力学的三重微分截面
DOI：
10.1103/physreva.102.062813
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发表时间：
2020
影响因子：
2.9
通讯作者：
er Dorn
中科院分区：
文献类型：
--
作者：
Enliang Wang;Xueguang Ren;Maomao Gong;Esam Ali;Zhenpeng Wang;Chao Ma;Don Madison;Xiangjun Chen;Alex;er Dorn
研究了四氢呋喃分子最高占据轨道在入射能量E0 = 91 eV时的电子碰撞电离三重微分截面（TDCS）.实验数据是使用反应显微镜测量的，它覆盖了能量范围从6到15 eV的二次电子发射的大部分立体角，以及从−10 °到−20 °的射弹散射角。实验TDCS跨所有测量的散射角和喷射能量的internormalized。它们进行了比较，从多中心扭曲波（MCDW）近似和修改后的MCDW-Nee方法，其中包括碰撞后相互作用（PCI）使用theWard-Macek因子的预测。使用分子三体扭曲波（M3 DW）方法获得了额外的计算，该方法在精确治疗中考虑了PCI。MCDW-Nee模型和M3 DW模型与实验结果的吻合程度要优于MCDW模型。这表明了在电子碰撞电离过程中，考虑低能出射电子的PCI的重要性。
We study the triple-differential cross section (TDCS) for the electron-impact ionization of the highest occupied molecular orbital of tetrahydrofuran at a projectile energy E0 = 91 eV. The experimental data were measured using a reaction microscope, which covers a large part of the full solid angle for the secondary electron emission with energies ranging from 6 to 15 eV, and projectile scattering angles ranging from −10◦ to −20◦. The experimental TDCSs are internormalized across all measured scattering angles and ejected energies. They are compared with predictions from the multicenter distorted-wave (MCDW) approximation and a modified MCDW-Nee method which includes the postcollision interaction (PCI) using theWard-Macek factor. Additional calculations were obtained using a molecular three-body distorted-wave (M3DW) approach which accounts for PCI in an exact treatment. Generally, the MCDW-Nee and M3DW models show better agreement with experiment than the MCDW calculations. This shows the importance of accounting for PCI for low-energy outgoing electrons in electron-impact ionization processes.