On the physical origin of propensity rules in collisions involving molecules in 2Σ electronic states
On the physical origin of propensity rules in collisions involving molecules in 2Σ electronic states
复制标题
2Σ电子态分子碰撞倾向规则的物理起源
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
G. C. Corey
中科院分区：
文献类型：
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作者：
M. Alexander;J. Smedley;G. C. Corey
发展了2S+1 π态双原子分子碰撞动力学的一般量子处理方法，特别强调了e/f分子对称标记守恒的碰撞倾向的物理起源。状态分辨积分截面被表示为张量不透明度的加权和，这些不透明度与碰撞将重新定向核旋转角动量矢量的概率有关。以前对2S+1Σ-态双原子分子碰撞倾向规则的推导仅限于突然近似或博恩近似。这里的一般推导是免费的动力学近似，并清楚地建立了直接的连接之间的观察到的倾向，为保持e/f分子对称性和碰撞倾向的核旋转角动量矢量的方向的保护。一个幂律模型建议由以前的半经验拟合的横截面为1 π +-sta...
A general quantum treatment of the collision dynamics of 2S+1Σ‐state diatomic molecules is developed, with particular emphasis given to the physical origin of the collisional propensity for conservation of the e/f molecular symmetry label. State‐resolved integral cross sections are expressed as a weighted sum of tensor opacities which are related to the probability that a collision will reorient the nuclear rotational angular momentum vector. Previous derivations of the propensity rules for collisions of 2S+1Σ‐state diatomic molecules were restricted to the sudden or Born approximations. Here a general derivation is developed that is free of dynamical approximations, and that clearly establishes the direct connection between the observed propensity for the conservation of the e/f molecular symmetry and the collisional propensity for the conservation of the orientation of the nuclear rotational angular momentum vector. A power‐law model suggested by previous semiempirical fits to cross sections for 1Σ+‐sta...