原子-双原子分子体系碰撞诱导中的量子干涉效应

Collisional quantum interference on rotational energy transfer in atom-diatom collision system

碰撞转动传能中存在量子干涉效应已经在静态池实验中被观测到,并且积分角也能被测量.但静态池掩盖了大量的实验信息,利用分子束实验可得到转动传能更准确的信息,进而得到影响干涉角的的具体因素.文中运用含时微扰的一级波恩近似理论和各向异性相互作用势,建立了原子-双原子分子(混合态)体系碰撞诱导转动能量传递中的量子干涉效应的理论模型,描述了观察和测量微分干涉角的方法,得到了微分干涉角与碰撞半径和碰撞速度间的关系,同时也得到了实验温度对微分干涉角的影响.此理论模型对于理解和进行分子束实验是非常重要的.

The collisional quantum interference （CQI） on rotational energy transfer was observed in the experiment of the static cell, and the integral interference angles were measured. To obtain more accu- rate information, the experiment in the molecular beam should be taken, from which the differential interference angle can be obtained. Based on the first-Born approximation of time-dependent perturbation theory, the theoretical model of CQI is developed in an atom-diatom collision system in the condition of the molecular beam. The model has taken into account the Lennard-Jones interaction potentials and ＂straight-line＂ trajectory approximation, and considered the open-shell M-states diatomic molecules electronic states. The effect factors that the interference angle depend on are investigated. The changing tendencies of the differential interference angle with the impact parameter, velocity, and collision partner are discussed. This theoretical model is important to understand or perform the experiment in the molecular beam.