Differential Cross Sections of F+HD→DF+H Reaction at Collision Energies from 3.03 meV to 17.97 meV  

低碰撞能3.03~17.97 meV内F+HD→DF+H的反应微分截面

作　　者：Heilong Wang Yu Li Zhirun Jiao Hongtao Zhang Chunlei Xiao Xueming Yang 王黑龙;李煜;焦志润;张宏涛;肖春雷;杨学明(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;中国科学院大学化学学院,北京100049;南方科技大学理学院,深圳518055;中国科学技术大学化学物理系,合肥230026)

机构地区：[1]State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [2]School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Science,Southern University of Science and Technology,Shenzhen 518055,China [4]Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2021年第6期925-931,I0005,共8页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.21822305,No.21688102,No.22003067);the Chinese Academy of Sciences(No.XDB17000000)。

摘　　要：The prototypical reaction of F+HD→DF+H was investigated at collision energies from 3.03 meV to 17.97 meV using a crossed molecular beam apparatus with multichannel Rydberg tagging time-of-flight detection.Significant contributions from both the BornOppenheimer(BO)forbidden reaction F^(*)(^(2)P_(1/2))+HD→DF+H and the BO-allowed reaction F(^(2)P_(3/2))+HD→DF+H were observed.In the backward scattering direction,the contribution from the BO-forbidden reaction F^(*)(^(2)P_(1/2))+HD was found to be considerably greater than the BO-allowed reaction F(^(2)P_(3/2))+HD,indicating the non-adiabatic effects play an important role in the dynamics of the title reaction at low collision energies.Collision-energy dependence of differential cross sections(DCSs)in the backward scattering direction was found to be monotonously decreased as the collision energy decreases,which does not support the existence of resonance states in this energy range.DCSs of both BO-allowed and BO-forbidden reactions were measured at seven collision energies from 3.03 meV to 17.97 meV.It is quite unexpected that the angular distribution gradually shifts from backward to sideway as the collision energy decreases from 17.97 meV to 3.03 meV,suggesting some unknown mechanisms may exist at low collision energies.

关 键 词：Reaction dynamics Crossed beam experiment Non-adiabatic effects Low collision energy 

分 类 号：O643.1[理学—物理化学]