Citation: ZHANG Xiu, WU Dong, TANG Bi-Feng. Vibrational Internal Energy of Chloromethyl Radical Formed by the Photodissociation of CH₂BrCl at 265 nm[J]. Acta Physico-Chimica Sinica, ;2012, 28(05): 1045-1053. doi: 10.3866/PKU.WHXB201203061 shu

Vibrational Internal Energy of Chloromethyl Radical Formed by the Photodissociation of CH₂BrCl at 265 nm

1.
1. Department of Physics, Hubei Engineering University, Xiaogan 432000, Hubei Province, P. R. China;
2. School of Physical Science and Technology, Huazhong Normal University, Wuhan 430079, P. R. China

Received Date: 21 December 2011
Available Online: 6 March 2012
Fund Project: 湖北省教育厅科学技术研究项目(Z20082601) (Z20082601)

Photodissociation of CH₂BrCl was investigated around 265 nm using resonance-enhanced multiphoton ionization technique combined with velocity map ion-imaging detection. The ion images of Br (²P_1/2) and Br (²P_3/2) were analyzed to obtain the corresponding velocity distributions and total translational energy distributions. Using an impulsive model invoking angular momentum conservation, the vibrational internal energy distributions of chloromethyl radical (·CH₂Cl) formed by the photodissociation of CH₂BrCl, were derived from the total translational energy distributions. In the CH₂BrCl+hv→Br (²P_1/2)+CH₂Cl channel, v₄, v₃+v₄, v₂+v₄ and v₂+v₆ vibrational modes were found to be excited in the radical; while in the CH₂BrCl+hv→ Br (²P_3/2)+CH₂Cl channel, the excited vibrational modes were v₂+v₆, v₁+v₃, v₂+v₅, v₂+v₃+v₅, and v₁+v₅. The results further implied that, following absorption of one photon by the parent molecule CH₂BrCl, other vibrational modes besides v₅ (CBr stretch) mode, such as v₇ (CH₂ a-stretch) mode, are excited in the parent molecule.
- CH₂BrCl,
- Photodissociation,
- Velocity map ion-imaging,
- Impulsive model invoking angular momentum conservation,
- Vibrational internal energy distribution
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Vibrational Internal Energy of Chloromethyl Radical Formed by the Photodissociation of CH2BrCl at 265 nm

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通讯作者: 陈斌, bchen63@163.com

Vibrational Internal Energy of Chloromethyl Radical Formed by the Photodissociation of CH₂BrCl at 265 nm