碰撞转动传能的量子干涉效应中微分干涉角的研究

摘要

转动传能的量子干涉效应在静态池实验中发现,并且已测得积分干涉角.为了得到更多关于传能的准确信息,应利用分子束进行实验.本文基于一阶含时波恩近似,模拟了利用分子束实验进行量子干涉效应研究的理论模型.此模型采用了Lennard-Jones相互作用势和直线轨道近似.通过本文建立的模型,研究了影响干涉效应的微分干涉角的因素,并且得到了徽分干涉角和碰撞速度、碰撞参数及碰撞体的关系.此理论模型对于指导分子束实验具有重要的意义.%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 accurate 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. 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.