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Quantum Interference Induced from the Λ Split of Π State Diatom
Li Yongqing,Sun Mengtao,Ma Fengcai*
Author NameAffiliationE-mail
Li Yongqing Department of PhysicsLiaoning UniversityShenyang 110036  
Sun Mengtao State Key Lab of Molecular Reaction DynamicsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023  
Ma Fengcai* Department of PhysicsLiaoning UniversityShenyang 110036 fcma@lnu.edu.cn 
Abstract:
To interpret theoretically the abnormal phenomenon in the experiment of collision-induced rotational energy transfer of CO(A1Π,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 surface,is presented. The abnormal phenomenon of σε→ε'ΔJ=0<σε→ε'ΔJ=±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.
Key words:  Collision-induced rotational energy transfer,Quantum interference,Cross section of energy transfer,Transition probability
FundProject:
Π态双原子分子Λ分裂引起的量子干涉
李永庆,孙萌涛,马凤才*
摘要:
为了从理论上解释Sun等在CO(A 1Π,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,最后对所得结果进行了讨论.
关键词:  碰撞诱导转动传能  量子干涉  传能截面  跃迁几率
DOI:10.1088/1674-0068/17/4/395-400
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