Abstract

The mobility of N⁺ ions in ground-state helium gas at very low temperature is examined with explicit inclusion of spin–orbit coupling effects. The ionic kinetics is treated theoretically with the three-temperature model. The N⁺–He interaction potentials, including spin–orbit coupling, are determined using high-level ab initio calculations. Then, the classical and quantal transport cross sections, both needed in the computation of the mobility coefficients, are calculated in terms of the collisional energy of the N⁺–He system. The numerical results, at temperature 4.3 K, show the spin–orbit interactions have negligible effect on the mobility coefficients.

Graphical abstract

中文翻译：

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自旋轨道效应在低温下氦气中移动的N +离子迁移率中的作用

摘要

N ⁺离子在非常低的温度下在基态氦气中的迁移率通过明确包含自旋轨道耦合效应进行了研究。理论上用三温模型处理离子动力学。N ⁺ -He相互作用势，包括自旋-轨道耦合，是使用高级从头计算确定的。然后，根据N ⁺ -He系统的碰撞能，计算了迁移率系数所需的经典和定量传输截面。在4.3 K温度下的数值结果表明，自旋轨道相互作用对迁移率系数的影响可以忽略不计。

图形概要