Depolarization, broadening and shift of Sr II and Ca II lines by helium atoms
Depolarization, broadening and shift of Sr II and Ca II lines by helium atoms
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氦原子对 Sr II 和 Ca II 线的去极化、展宽和移动
DOI：
10.1088/0022-3700/8/16/027
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发表时间：
1975
期刊：
影响因子：
--
通讯作者：
È. Roueff
中科院分区：
文献类型：
--
作者：
A. Giusti;È. Roueff
将碱金属-稀有气体碰撞的半经典处理方法推广到碱土金属离子Ca ~+和Sr ~+受氦原子扰动的情形。的计算进行的加宽和移位常数，以及为不同的弛豫常数特征的碰撞。计算中使用了货车范德华势和交换模型势，后者被证明对所考虑的过程占主导地位。另一方面，精细结构和非绝热效应被考虑在半经典近似的框架内，也是轨迹效应的情况下，只有一个潜在的曲线是参与。计算的截面是相同的数量级为相应的碱金属和合理的协议与现有的实验。
The semiclassical treatment used for alkali-rare-gas collisions is extended to the case of the alkaline-earth ions Ca+ and Sr+ perturbed by helium atoms. The calculations are performed for the broadening and shift constants, as well as for the different relaxation constants characterizing the collision. The van der Waals potential and the exchange model potential are used in the calculations and the latter is shown to be predominant for the processes considered. On the other hand, fine structure and non-adiabatic effects are taken into account in the framework of the semiclassical approximation as also are trajectory effects for the cases where only one potential curve is involved. The calculated cross sections are of the same order of magnitude as for the corresponding alkalis and in reasonable agreement with the available experiments.