CH2BrCl在265 nm光解产生的氯甲基自由基的振动内能

doi:10.3866/PKU.WHXB201203061

物理化学学报 >> 2012, Vol. 28 >> Issue (05): 1045-1053.doi: 10.3866/PKU.WHXB201203061

CH₂BrCl在265 nm光解产生的氯甲基自由基的振动内能

张秀¹, 吴东², 唐碧峰¹

1. 湖北工程学院物理系, 湖北孝感 432000;
2. 华中师范大学物理科学与技术学院, 武汉 430079

收稿日期:2011-12-21 修回日期:2012-03-05 发布日期:2012-04-26
通讯作者: 唐碧峰 E-mail:tangbf@wipm.ac.cn
基金资助:
湖北省教育厅科学技术研究项目(Z20082601)

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

ZHANG Xiu¹, WU Dong², TANG Bi-Feng¹

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:2011-12-21 Revised:2012-03-05 Published:2012-04-26
Contact: TANG Bi-Feng E-mail:tangbf@wipm.ac.cn
Supported by:
The project was supported by the Science Foundation of the Education Department of Hubei Province, China (Z20082601).

摘要/Abstract

摘要： 利用离子速度影像技术研究了CH₂BrCl 在265 nm附近的激光光解. 利用2+1 共振增强多光子电离分别获得光解产物Br (²P_1/2)和Br (²P_3/2)的离子速度图像, 从而得出Br (²P_1/2)和Br (²P_3/2)的速度分布, 以及光解碎片的总平动能分布. 据此, 运用角动量守恒碰撞模型获得了解离氯甲基自由基(·CH₂Cl)的振动内能分布. 研究结果表明: CH₂BrCl+hv→Br (²P_1/2)+CH₂Cl 通道产生的氯甲基自由基中被激发的振动模主要是v₄、v₃+v₄、v₂+v₄和v₂+v₆; CH₂BrCl+hv→Br (²P_3/2)+CH₂Cl 通道产生的氯甲基自由基中被激发的振动模主要是v₂+v₆、v₁+v₃、v₂+v₅、v₂+v₃+v₅ 和v₁+v₅; 母体分子CH₂BrCl 在吸收光解光子后除有v₅ (CBr stretch)振动模被激发外, 还有v₇ (CH₂a-stretch)等其它振动模也被激发.

关键词: CH₂BrCl, 光解, 离子速度影像, 角动量守恒碰撞模型, 振动内能分布

Abstract: 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.

Key words: CH₂BrCl, Photodissociation, Velocity map ion-imaging, Impulsive model invoking angular momentum conservation, Vibrational internal energy distribution

张秀, 吴东, 唐碧峰. CH₂BrCl在265 nm光解产生的氯甲基自由基的振动内能[J]. 物理化学学报, 2012, 28(05), 1045-1053. doi: 10.3866/PKU.WHXB201203061

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

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201203061

https://www.whxb.pku.edu.cn/CN/Y2012/V28/I05/1045

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CH₂BrCl在265 nm光解产生的氯甲基自由基的振动内能

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

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