Collisional alignment and orientation of atomic outer shells. II. Quasi-molecular excitation, and beyond
Collisional alignment and orientation of atomic outer shells. II. Quasi-molecular excitation, and beyond
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原子外壳的碰撞排列和方向。
DOI：
10.1016/s0370-1573(96)00026-9
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
I. Hertel
中科院分区：
文献类型：
--
作者：
N. Andersen;J. Broad;E. Campbell;J. W. Gallagher;I. Hertel
我们对碰撞激发后的原子排列和方向进行了全面和批判性的审查，包括对迄今为止在文献中发表的数据的全面重新评估和讨论。现在的卷。 II 重点研究离子-原子和原子-原子过程中的准分子低能状态。讨论集中在平面散射几何的实验和理论数据上，其中排列和方向参数被确定为散射角的函数（粒子光子重合或激光激发原子的散射，即所谓的第三代实验）。此外，还讨论了圆柱对称的对准研究（第二代实验）和积分横截面（第一代实验），只要这可以澄清对相关过程的理解。参考所谓的自然坐标系（其 z 轴垂直于碰撞平面）使用一组统一的参数：角动量转移 L⊥、对准角 γ、线性偏振 P+ 和对称性改变概率 ϱ00。这种参数化允许人们对这些有些抽象的量进行直观的解释。在回顾了理论框架之后，描述了各个模型系统，从真正的单电子系统 H++ H 中的激发和电荷转移开始，到涉及许多电子的 He++ Rg（Rg = 稀有气体原子）碰撞结束，并展示了自旋轨道耦合的显式影响。在几个附录中，报告了相关经典偏转函数的汇编以及许多用于解释对准和方向参数的有用公式。
We present a comprehensive and critical review on atomic alignment and orientation after collisional excitation including a full reevaluation and discussion of data published to date in the literature. The present Vol. II focuses on the quasimolecular low-energy regime in ion-atom and atom-atom processes. The discussion centers on experimental and theoretical data for planar scattering geometry in which the alignment and orientation parameters are determined as a function of scattering angle (particle-photon coincidence or scattering from laser-excited atoms, the so-called third-generation of experiments). In addition, alignment studies with cylindrical symmetry (second-generation experiments) and integral cross sections (first-generation experiments) are also discussed wherever this clarifies the understanding of the relevant processes. A unified set of parameters is used with reference to the so-called natural coordinate frame (having its z-axis perpendicular to the collision plane): the angular momentum transfer L⊥, the alignment angle γ, the linear polarization P+and the symmetry-changing probability ϱ00. This parametrization allows one an intuitive interpretation of these otherwise somewhat abstract quantities. After reviewing the theoretical framework the individual model systems are described, starting with excitation and charge transfer in the genuine one-electron system H++ H and ending with He++ Rg (Rg = raregas atom) collisions involving many electrons and demonstrating the explicit influence of spin-orbit coupling. In several appendices a compilation of the relevant classical deflection functions and many useful formulae for the interpretation of alignment and orientation parameters are reported.