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H+HD→H2+D反应的高分辨交叉分子束实验研究
桑继伟1, 袁道福1, 陈文韬1, 俞盛锐2, 罗 畅1, 王思雯1, 汪 涛3,4, 杨学明*3,4, 王兴安*1
1.中国科学技术大学化学物理系,合肥 230026;2.浙江师范大学杭州高等研究院,杭州 311231;3.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;4.南方科技大学理学院化学系,深圳 518055
摘要:
本文利用交叉分子束方法和离子速度成像技术,对H+HD→H2+D反应在1.17 eV碰撞能下的态-态反应动力学开展了高分辨实验研究. 实验采用1+1'(真空紫外+紫外)近阈值激光电离方式对反应中的D原子产物进行探测,获得了高角度分辨和高能量分辨的产物离子速度影像,进而精确获得了反应的态-态微分截面. 实验观测到了H2(v'=0,j'=1)和H2(v'=0,j'=3)振转产物角分布中与散射过程的干涉效应相联系的前向散射振荡. 这一研究进一步表明了化学反应微分截面的精确测量在气相态-态反应动力学研究中的重要性.
关键词:  交叉分子束,时间切片离子速度成像,阈值电离,态-态反应微分截面,散射振荡
DOI:10.1063/1674-0068/cjcp1901010
分类号:
基金项目:
High Resolution Crossed Molecular Beams Study of the H+HD→H2+D Reaction
Ji-wei Sang1, Dao-fu Yuan1, Wen-tao Chen1, Sheng-rui Yu2, Chang Luo1, Si-wen Wang1, Tao Wang3,4, Xue-ming Yang*3,4, Xing-an Wang*1
1.Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China;3.Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;4.Department of Chemistry, School of Science, Southern University of Science and Technology, Shenzhen 518055, China
Abstract:
The H+H2 reaction is the simplest chemical reaction system and has long been the prototype model in the study of reaction dynamics. Here we report a high resolution experimental investigation of the state-to-state reaction dynamics in the H+HD→H2+D reaction by using the crossed molecular beams method and velocity map ion imaging technique at the collision energy of 1.17 eV. D atom products in this reaction were probed by the near threshold 1+1'(vacuum ultraviolet+ultraviolet) laser ionization scheme. The ion image with both high angular and energy resolution were acquired. State-to-state differential cross sections was accurately derived. Fast forward scattering oscillations, relating with interference effects in the scattering process, were clearly observed for H2 products at H2(v'=0,j'=1) and H2(v'=0,j'=3) rovibrational levels. This study further demonstrates the importance of measuring high-resolution differential cross sections in the study of state-to-state reaction dynamics in the gas phase.
Key words:  Crossed molecular beams, Velocity map ion imaging, Threshold ionization, Forward scattering oscillations, High resolution, Differential cross sections