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Near-UV Photodissociation Dynamics of Thiomethoxy Radical via eA2A1 State: H-atom Product Channe
Xian-feng Zheng,Yu Song,Jing-ze Wu,Jing-song Zhang*
Author NameAffiliationE-mail
Xian-feng Zheng Department of Chemistry, Air Pollution Research Center, University of California, Riverside, CA 92521, USA; Department of Physics, Anhui Normal University, Wuhu 241000, China  
Yu Song Department of Chemistry, Air Pollution Research Center, University of California, Riverside, CA 92521, USA  
Jing-ze Wu Department of Chemistry, Air Pollution Research Center, University of California, Riverside, CA 92521, USA  
Jing-song Zhang* Department of Chemistry, Air Pollution Research Center, University of California, Riverside, CA 92521, USA jingsong.zhang@ucr.edu 
Abstract:
Photodissociation dynamics of jet-cooled thiomethoxy radical (CH3S) via the eA2A1? eX2E transition is investigated near 352 nm. The H-atom product channel is observed directly for the ˉrst time by H-atom product yield spectrum and photofragment translational spectroscopy. The 2132 vibrational level of the eA2A1 state dissociates to the H+H2CS products. The H+H2CS product translational energy release is modest and peaks around 33 kJ/mol; the H-atom angular distribution is isotropic. The dissociation mechanism is consistent with internal conversion of the excited eA2A1 state to the eX2E ground state and subsequent unimolecular dissociation on the ground state to the H+H2CS products.
Key words:  Photodissociation dynamics, Thiomethoxy radical
FundProject:
CH3S自由基eA2A1态的近紫外光解动力学: 氢原子产物通道
郑贤锋,宋煜,吴京泽,张劲松*
摘要:
实验研究射流冷却CH3S自由基eA2A1态在352 nm的光解动力学. 应用氢原子产额谱和光碎片平动能谱方法第一次直接观察到氢原子产物解离通道.CH3S自由基eA2A1态2132振动能级解离为H和H2CS产物.H+H2CS产物平动能释放较小,平动能峰值接近33.4 kJ/mol.氢原子产物角分布是各向同性.H+H2CS产物是经eA2A1激发态向X2E基态内转变,紧接着在基态势能面上解离产生.
关键词:  光解动力学, CH3S 自由基
DOI:10.1088/1674-0068/20/04/377-382
分类号: