Polarization and exchange effects in elastic scattering of electron with atoms and ions

doi:10.1088/1674-1056/27/5/053403

中国物理B ›› 2018, Vol. 27 ›› Issue (5): 53403-053403.doi: 10.1088/1674-1056/27/5/053403

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Polarization and exchange effects in elastic scattering of electron with atoms and ions

Zhang-Jin Chen(陈长进), Dan-Dan Cui(崔丹丹)

Department of Physics, College of Science, Shantou University, Guangdong 515063, China

收稿日期:2017-12-31 修回日期:2018-01-24 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: Zhang-Jin Chen E-mail:chenzj@stu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.11274219) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry,China.

Polarization and exchange effects in elastic scattering of electron with atoms and ions

Zhang-Jin Chen(陈长进), Dan-Dan Cui(崔丹丹)

Department of Physics, College of Science, Shantou University, Guangdong 515063, China

Received:2017-12-31 Revised:2018-01-24 Online:2018-05-05 Published:2018-05-05
Contact: Zhang-Jin Chen E-mail:chenzj@stu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.11274219) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry,China.

摘要/Abstract

摘要： Laser-induced electron diffraction (LIED), in which elastic scattering of the returning electron with the parent ion takes place, has been used to extract atomic potential and image molecular structures with sub-Å precision and exposure time of a few femtoseconds. So far, the polarization and exchange effects have not been taken into account in the theoretical calculation of differential cross section (DCS) for the laser-induced rescattering processes. However, the validity of this theoretical treatment has never been verified. In this work, we investigate the polarization and exchange effects on electron impact elastic scattering with rare gas atoms and ions. It is found that, while the exchange effect generally plays a more important role than the polarization effect in the elastic scattering process, the exchange effect is less important on electron-ion collisions than on electron-atom collisions, especially for scattering in backward direction. In addition, our calculations show that, for electron-atom collisions at incident energies above 50 eV, both the polarization and exchange effects can be safely neglected, while for electron-ion collisions, both the polarization and exchange potentials do not make substantial contributions to the DCS at incident energies above 20 eV and scattering angles larger than 90°. Our investigation confirms the validity of the current LIED method.

关键词: polarization, exchange, elastic scattering, differential cross sections

Abstract: Laser-induced electron diffraction (LIED), in which elastic scattering of the returning electron with the parent ion takes place, has been used to extract atomic potential and image molecular structures with sub-Å precision and exposure time of a few femtoseconds. So far, the polarization and exchange effects have not been taken into account in the theoretical calculation of differential cross section (DCS) for the laser-induced rescattering processes. However, the validity of this theoretical treatment has never been verified. In this work, we investigate the polarization and exchange effects on electron impact elastic scattering with rare gas atoms and ions. It is found that, while the exchange effect generally plays a more important role than the polarization effect in the elastic scattering process, the exchange effect is less important on electron-ion collisions than on electron-atom collisions, especially for scattering in backward direction. In addition, our calculations show that, for electron-atom collisions at incident energies above 50 eV, both the polarization and exchange effects can be safely neglected, while for electron-ion collisions, both the polarization and exchange potentials do not make substantial contributions to the DCS at incident energies above 20 eV and scattering angles larger than 90°. Our investigation confirms the validity of the current LIED method.

Key words: polarization, exchange, elastic scattering, differential cross sections

中图分类号: (Elastic scattering)

34.80.Bm

34.80.Dp (Atomic excitation and ionization) 32.80.Rm (Multiphoton ionization and excitation to highly excited states)

陈长进, 崔丹丹. Polarization and exchange effects in elastic scattering of electron with atoms and ions[J]. 中国物理B, 2018, 27(5): 53403-053403.

Zhang-Jin Chen(陈长进), Dan-Dan Cui(崔丹丹). Polarization and exchange effects in elastic scattering of electron with atoms and ions[J]. Chin. Phys. B, 2018, 27(5): 53403-053403.

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Polarization and exchange effects in elastic scattering of electron with atoms and ions

Polarization and exchange effects in elastic scattering of electron with atoms and ions

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