Crossed Molecular Beam Study of H+CH4 and H+CD4 Reactions: Vibrationally Excited CH3/CD3 Product Channels

• Published in: Chinese journal of chemical physics 2017-12, Vol.30 (6), p.609-613
• Main Authors: Chen, Wen-tao, Yu, Sheng-rui, Yuan, Dao-fu, Xie, Ting, Yang, Jia-yue, Wang, Si-wen, Luo, Chang, Tan, Yu-xin, Miao, Yue, Zhang, Wei-qing, Wu, Guo-rong, Yang, Xue-ming, Wang, Xing-an
• Format: Article
• Language: English
• ISSN: 1674-0068; 2327-2244
• DOI: 10.1063/1674-0068/30/cjcp1711215

We study the H+CH4/CD4→H2/HD+CH3/CD3 reactions using the time sliced velocity map ion imaging technique. Ion images of the CH3/CD3 products were measured by the (2+1) resonance enhanced multi-photon ionization (REMPI) detection method. Besides the CH3/CD3 products in the ground state, ion images of the vibrationally excited CH3/CD3 products were also observed at two collision energies of 0.72 and 1.06 eV. It is shown that the angular distribution of the products CH3/CD3 in vibrationally excited states gradually vary from backward scattering to sideways scattering as the collision energy increases. Compared to the CH3/CD3 products in the ground state, the CH3/CD3 products in vibrationally excited states tend to be more sideways scattered, indicating that larger impact parameters play a more important role in the vibrationally excited product channels.