Π态双原子分子Λ分裂引起的量子干涉  

Quantum Interference Induced from the Λ Split of Π State Diatom

作　　者：李永庆[1] 孙萌涛[2] 马凤才[1] 

机构地区：[1]辽宁大学物理系,沈阳110036 [2]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

出　　处：《Chinese Journal of Chemical Physics》2004年第4期395-400,共6页化学物理学报（英文）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina (10 3 740 40 )

摘　　要：为了从理论上解释Sun等在CO(A1 Π ,v =3 )和He碰撞实验中转动传能截面的反常现象 ,考虑一级含时波恩近似、长程相互作用势和直线轨道近似 ,建立了Π态双原子分子由于Λ分裂引起量子干涉的理论模型 .运用这一理论模型 ,成功的解释了实验中碰撞伴为He时转动传能截面的反常现象 :σε→ε′△J =0 <σε→ε′△J =± 1 .首先介绍了碰撞诱导转动传能中量子干涉效应的研究进展 ,然后建立了Π态双原子分子由于Λ分裂引起量子干涉的理论模型 。To interpret theoretically the abnormal phenomenon in the experiment of collision induced rotational energy transfer of CO (A 1Π, v =3) with He by Sun et al. , the time dependent first order Born approximation, and the long range interaction potentials and “straight line” trajectory approximation are taken into account. A theoretical model of quantum interference of Π state diatomic molecules, which originates from the difference between the two Λ related collision potential energy surfaces, is presented. The abnormal phenomenon of σ ε→ε′ △J=0 <σ ε→ε′ △J=±1 for He is also interpreted successfully. At first the theoretical development of collision induced quantum interference on rotational energy transfer is reported; then a theoretical model of quantum interference of Π state diatomic molecules, which originates from the difference between the two Λ related collision potential energy surfaces, is presented; in the end the results have been discussed and concluded.

关 键 词：碰撞诱导转动传能 量子干涉 传能截面 跃迁几率 

分 类 号：O641[理学—物理化学]