Stereodynamical control of the H plus HD → H2+D reaction through HD reagent alignment

• 成果类型: Article
• 署名作者: Wang, Yufeng; Huang, Jiayu; Wang, Wei; Du, Tianyu; Xie, Yurun; Ma, Yuxin; Xiao, Chunlei; Zhang, Zhaojun; Zhang, Dong H.; Yang, Xueming
• 署名单位: Chinese Academy of Sciences; Dalian Institute of Chemical Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Southern University of Science & Technology; Southern University of Science & Technology; Hefei National Laboratory
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-14137
• DOI: 10.1126/science.ade7471
• 发表日期: 2023-01-13
• 页码: 191-195
• 关键词: bimolecular reactions; DYNAMICS; resonances; methane; mode; bond; stereochemistry; orientation; collisions; molecules

摘要

Prealigning nonpolar reacting molecules leads to large stereodynamical effects because of their weak steering interaction en route to the reaction barrier. However, experimental limitations in preparing aligned molecules efficiently have hindered the investigation of steric effects in bimolecular reactions involving hydrogen. Here, we report a high-resolution crossed-beam study of the reaction H + HD(v = 1, j = 2) -> H2(v ', j ') + D at collision energies of 0.50, 1.20, and 2.07 electron volts in which the vibrationally excited hydrogen deuteride (HD) molecules were prepared in two collision configurations, with their bond preferentially aligned parallel and perpendicular to the relative velocity of collision partners. Notable stereodynamical effects in differential cross sections were observed. Quantum dynamics calculations revealed that strong constructive interference in the perpendicular configuration plays an important role in the stereodynamical effects observed.