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Ion-Velocity Map Imaging Study of Photodissociation Dynamics of Acetaldehyde
Zhi-guo Zhang1,2, Zhi-chao Chen2, Cui-mei Zhang1,2, Yan-ling Jin2, Qun Zhang1, Yang Chen1, Cun-shun Huang2, Xue-ming Yang1,2
1.Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China
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1,2, 陈志超2, 张翠梅1,2, 金艳玲2, 张群*1, 陈旸*1, 黄存顺2, 杨学明*1,2
1.中国科学技术大学微尺度国家实验室(筹),化学物理系,合肥 230026;2.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
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
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