Deep minima in the Coulomb-Born triply differential cross sections for ionization of helium by electron and positron impact

Deep minima in the Coulomb-Born triply differential cross sections for ionization of helium by electron and positron impact
复制标题

电子和正电子碰撞氦电离的库仑三微分截面中的深极小值

DOI:
10.1140/epjd/e2019-100512-x
复制
发表时间:
2020
期刊:
The European Physical Journal D
影响因子:
--
通讯作者:
Ward, Sandra J.
Ward, Sandra J.
中科院分区:
--
文献类型:
--
作者:
DeMars, Cody M.;Kent, Jesse B.;Ward, Sandra J.

文献摘要

参考文献

被引文献

相似文献

摘要:此前,入射能量为 64.6 eV 时电子-氦电离的三重微分截面 (TDCS) 测量中的深度最小值是用涡旋来解释的。我们在相同的入射能量下将库仑玻恩(CB1)和修正的CB1近似应用于该过程,并获得了一个深度最小值,其位置与时间相关的紧耦合结果和实验数据合理一致。我们还获得了 TDCS 的深度最小值,测量能量为 74.6 eV。对于两种入射能量,但枪角度与实验中使用的略有不同,我们在 TDCS 中获得了非常深的最小值,该最小值与与 CB1 过渡矩阵元素相关的速度场中的涡旋相关。我们确定 CB1 TDCS 中深度最小值的枪和极角为 44.6 eV–79.6 eV 的能量。我们将这两种近似应用于正电子氦电离。对于 205.25 eV 的入射能量,我们发现 TDCS 中的深度最小值与 CB1 转换矩阵元素相关的速度场中的涡旋有关。图形摘要
AbstractPreviously, a deep minimum in the measurements of the triply differential cross section (TDCS) for electron-helium ionization at an incident energy of 64.6 eV was interpreted in terms of a vortex. We apply the Coulomb-Born (CB1) and modified CB1 approximations to this process at the same incident energy and obtain a deep minimum whose position is in reasonable accord with time-dependent close-coupling results and experimental data. We also obtain the deep minimum in the TDCS that was measured for an energy of 74.6 eV. For both incident energies, but at slightly different gun angles to those used experimentally, we obtain a very deep minimum in the TDCS that is related to a vortex in the velocity field associated with the CB1 transition matrix element. We determine for energies of 44.6 eV–79.6 eV the gun and polar angles for a deep minimum in the CB1 TDCS. We apply both approximations to positron-helium ionization. For an incident energy of 205.25 eV we find a deep minimum in the TDCS that is related to a vortex in the velocity field associated with the CB1 transition matrix element.Graphical abstract
电离碰撞中的涡流
DOI: --
发表时间: 2016
期刊:
影响因子: --
作者:
F. Navarrete;R. Barrachina
通讯作者: R. Barrachina
DOI: --
发表时间: 1992
影响因子: 8.6
作者:
J. Botero;Macek Jh
通讯作者: Macek Jh
DOI: --
发表时间: 1992
期刊: Physical Review A. Atomic, Molecular, and Optical Physics
影响因子: --
作者:
Botero;Macek
通讯作者: Macek
散射角和能量对称的氦 (e,2e) 微分横截面从共面几何到垂直平面几何的演变。
DOI: 10.1103/physreva.47.3724
发表时间: 1993
期刊: Physical review. A, Atomic, molecular, and optical physics
影响因子: --
作者:
Murray;Read
通讯作者: Read
原子过程中角动量和能量转移的流体动力学解释
DOI: --
发表时间: 2014
期刊:
影响因子: --
作者:
S. Y. Ovchinnikov;J. Macek;D. Schultz
通讯作者: D. Schultz