碰撞转动传能的量子干涉效应中微分干涉角的研究

The differential interference angle in Collisional quantum interference on rotational energy transfer

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,并且得到了微分干涉角和碰撞速度、碰撞参数及碰撞伴的关系.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 accu- rate information, the experiment in the molecular beam should be taken, from which the differential in- terference 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 in- vestigated. The changing tendencies of the differential interference angle with the impact parameter, ve- locity, and collision partner are discussed. This theoretical model is important to understand or perform the experiment in the molecular beam.