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Ion-Velocity Map Imaging Study of Photodissociation Dynamics of Acetaldehyde
Zhi-guo Zhang,Zhi-chao Chen,Cui-mei Zhang,Yan-ling Jin,Qun Zhang,Yang Chen,Cun-shun Huang,Xue-ming Yang
Author NameAffiliationE-mail
Zhi-guo Zhang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Zhi-chao Chen State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Cui-mei Zhang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Yan-ling Jin State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Qun Zhang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China qunzh@ustc.edu.cn 
Yang Chen Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China yangchen@ustc.edu.cn 
Cun-shun Huang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China  
Xue-ming Yang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China cshuang@dicp.ac.cn 
Abstract:
The photodissociation dynamics of acetaldehyde in the radical channel CH3+HCO has been reinvestigated using time-sliced velocity map imaging technique in the photolysis wavelength range of 275?321 nm. The CH3 fragments have been probed via (2+1) resonance-enhanced multiphoton ionization. Images are measured for CH3 formed in the ground and excited states (v2=0 and 1) of the umbrella vibrational mode. For acetaldehyde dissociation on T1 state after intersystem crossing from S1 state, the products are formed with high translational energy release and low internal excitation. The rotational and vibrational energy of both fragments increases with increasing photodissociation energy. The triplet barrier height is estimated at 3.881±0.006 eV above the ground state of acetaldehyde.
Key words:  Ion-velocity map imaging, Photodissociation dynamics, Acetaldehyde
FundProject:
乙醛光解动力学的离子速度成像
张志国,陈志超,张翠梅,金艳玲,张群*,陈旸*,黄存顺,杨学明*
摘要:
利用时间切片离子速度成像技术在275~321 nm能量范围内重新研究了乙醛自由基通道CH3+HCO的光解动力学. 通过共振增强多光子电离的方法探测甲基碎片. 对甲基的伞形振动基态和激发态(v2=0和1)进行了影像探测. 乙醛通过T1电子态系间窜越到S1电子态的解离产物具有很高的动能释放和很低的内能激发,碎片的振动能和转动能随激发能量的增加而增加. 乙醛T1电子态的势垒高度经测量高于基电子态3.881±0.006 eV.
关键词:  离子速度成像,光解动力学,乙醛
DOI:10.1063/1674-0068/27/03/249-255
分类号: