物理化学学报 >> 2006, Vol. 22 >> Issue (05): 602-607.doi: 10.3866/PKU.WHXB20060517

研究论文 上一篇    下一篇

1Π态双原子分子中关于Λ量子干涉的微分干涉角

李永庆;李健;宋朋;马凤才   

  1. 辽宁大学物理系,沈阳110036;中国科学院大连化学物理研究所分子反应动力学国家重点实验室, 大连 116023
  • 收稿日期:2005-11-30 修回日期:2006-01-17 发布日期:2006-04-28
  • 通讯作者: 马凤才 E-mail:fcma@lnu.edu.cn

The Differential Interference Angle of Λ-Related Quantum Interference of 1Π-state Diatom

LI Yong-Qing;LI Jian;SONG Peng;MA Feng-Cai   

  1. Department of Physics, Liaoning University, Shenyang 110036, P. R. China; State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
  • Received:2005-11-30 Revised:2006-01-17 Published:2006-04-28
  • Contact: MA, Feng-Cai E-mail:fcma@lnu.edu.cn

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摘要： Sha 等在静态池实验中观察到了转动能量转移中的碰撞量子干涉, 并且计算了决定跃迁散射截面的积分干涉角(J. Chem. Phys., 1995, 102：2772). 由于积分干涉角是微分干涉角的平均效应, 为了得到更精确的信息, 进行了分子束实验.作者文运用含时微扰的一级波恩近似理论, 提出了衡量干涉程度的1乇态双原子分子中关于Λ量子干涉的微分干涉角. 利用各向异性相互作用势计算了其干涉角. 得到分子束实验中微分干涉角随实验参数,包括实验温度、碰撞伴、作用距离和转动量子数变化的关系. 并且讨论了影响干涉角的各种参数. 此理论模型对理解和进行分子束实验是非常重要的.

关键词: 量子干涉, 碰撞诱导转动传能, 微分干涉角, 各向异性相互作用势, 分子束实验

Abstract: Collisional quantum interference (CQI) on rotational energy transfer was observed by Sha et al.(J. Chem.Phys., 1995, 102：2772) in static cell, and the integral interference angle which determines the magnitudes of the transition cross sections was measured. To obtain more precise information, the experiment in the molecular beam should be taken, as the integral interference angle is the average effect of the differential interference angle. Thedifferential interference angle of Λ-Related Quantum Interference of 1Π-state diatom was presented to measure the degree of coherence, by using the first order Born approximation of time-dependent perturbation theory. The anisotropic Lennard-Jones interaction potential is employed to simulate their interference angles. The relationships of the differential interference angle versus the factors of the experiment in the molecular beam, including experimental temperature, partners, the distance of the interaction and rotational quantum number, are obtained. And the various factors that influen ce the interference angles are discussed. This theoretical model is important to understand orperformin the experiment of the molecular beam.

Key words: Quantuminterference, Collision-induced rotational energy