首页> 外文期刊>Journal of Computational Methods in Sciences and Engineering >Double electron capture in fast ion-atom collisions
【24h】

Double electron capture in fast ion-atom collisions

机译:快速离子原子碰撞中的双电子捕获

获取原文
获取原文并翻译 | 示例

摘要

A four-body formalism of the modified target continuum distorted wave (MTCDW-4B) with incorrect boundary conditions and boundary corrected continuum intermediate state (BCCIS-4B) approximation have been employed to calculate the differential cross sections (DCS) and total cross sections (TCS) for double-electron capture (DC) in collision of fast bare ions with helium atoms in their ground states. In both these formalisms, the intermediate continuum state of each of the active electrons with the target has been taken into account. The influence of the static-electron-correlations on cross sections has also been taken into account by choosing the proper wave functions of the initial states of the bound electrons. Moreover, we have computed the cross sections using the asymptotic Coulomb logarithmic phase for the relative motion of two colliding nuclei in BCCIS-4B theory. The present computed results are compared with the available experimental and other existing theoretical results. TCS are found to be in good agreement with the measurements. In addition, we have also analyzed DCS for DC in the collision of alpha-particles with helium atoms at intermediate and high projectile energies. We have investigated the significance of the contributions to TCS and DCS from excited states (both single and double) of He and Li+ especially in comparison between theories and measurements. For symmetric collision, the ground state capture dominates over the excited states whereas for asymmetric collision, the excited states including singly and doubly excited states dominate over the ground state capture. It is also clear that the ground state contribution dominates at very high impact energies for asymmetric collision. The obtained results for DCS into the ground state and excited states are compared with the experimental data and overall satisfactory agreements have been found at different impact energies.
机译:已经采用了与不正确的边界条件和边界校正的连续局部中间状态(BCCIS-4B)近似的修改目标连续体扭曲波(MTCDW-4B)的四体形式主义,以计算差分横截面(DC)和总横截面( TCS)对于双电子捕获(DC)在其地位中氦原子的快速裸露离子的碰撞。在这两种形式主义中,已经考虑了具有目标的每个活性电子的中间连续状态。通过选择结合电子的初始状态的适当波函数,还考虑了静态电子相关对横截面的影响。此外,我们使用了BCCIS-4B理论中的两个碰撞核的相对运动来计算横截面。将本计算结果与可用的实验和其他现有理论结果进行比较。发现TCS与测量有关。此外,我们还在中间和高射弹能量的氦原子的α-颗粒的碰撞中分析了DC的DC。我们已经调查了对TCS和DC的贡献的重要性,从兴奋状态(单一和双),尤其是在理论和测量之间进行比较。对于对称碰撞,地面状态捕获在兴奋状态下占主导地位,而对于不对称的碰撞,兴奋状态包括单独和双重激发状态在地面捕获上占据主导地位。还显然,地面状态贡献在非常高的冲击性能下占据了不对称碰撞的非常高的冲击能量。将DC的结果与实验数据进行比较,并在不同的影响能力下发现了整体令人满意的协议。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号