Ultraviolet photodissociation of C2F5I with a small and simple photofragment translational spectrometer
文献类型：期刊论文
| 作者 | Yu, Zijun1,2; Xu, Xiling1,2; Cheng, Min1,2; Yu, Dan1,2; Du, Yikui1; Zhu, Qihe1 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2009-07-28 |
| 卷号 | 131期号:4 |
| 关键词 | Molecule-photon Collisions Organic Compounds Photodissociation Potential Energy Surfaces Rotational-vibrational Energy Transfer |
| ISSN号 | 0021-9606 |
| DOI | 10.1063/1.3186737 |
| 英文摘要 | Photodissociation dynamics of C2F5I near 280 and 304 nm has been investigated on a small and simple time-of-flight photofragment translational spectrometer (PTS). On this new PTS, the photolyzed and ionized fragments, not accelerated by electric field, travel freely for a short flight path (< 50 mm) and are detected by microchannel plates. In the spectra of the I-*(P-2(1/2)) channel at 281.73 and 304.02 nm, vibrational peaks with spacing of similar to 350 cm(-1) are partially resolved, indicating the preferential excitation of CF2 wag mode (nu(11)=366 cm(-1)) of C2F5 photofragment. The fraction of the available energy disposed into the internal energy is higher than 50% for both I-* channel and I channel, showing the high excitation of vibration in the C2F5 fragments. The fragment recoil anisotropy parameter beta(I-*), determined to be 1.70 at 281.73 nm and 1.64 at 304.02 nm, reveals that I-* atoms are produced predominantly from the parallel (3)Q(0)<- N transition. The anisotropy parameter beta(I), determined to be 1.25 at 279.71 nm and 0.88 at 304.67 nm, implies that I atoms are produced from two excited states, i.e., direct dissociation via the perpendicular (3)Q(1)<- N transition, and indirect dissociation via the parallel (3)Q(0)<- N transition then curve crossing to the (1)Q(1) potential energy surface. Analysis on the recent studies with vibrational state resolution in the photodissociation of alkyl iodides in the A band reveals that the "symmetric bending" mode on alpha-carbon of alkyl iodides is the preferential vibrational excitation mode, which can be explained by the classic impulsive model. |
| 语种 | 英语 |
| WOS记录号 | WOS:000268613700054 |
| 出版者 | AMER INST PHYSICS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/67521]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Du, Yikui |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Natl Lab Mol Sci, State Key Lab Mol React Dynam, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Zijun,Xu, Xiling,Cheng, Min,et al. Ultraviolet photodissociation of C2F5I with a small and simple photofragment translational spectrometer[J]. JOURNAL OF CHEMICAL PHYSICS,2009,131(4). |
| APA | Yu, Zijun,Xu, Xiling,Cheng, Min,Yu, Dan,Du, Yikui,&Zhu, Qihe.(2009).Ultraviolet photodissociation of C2F5I with a small and simple photofragment translational spectrometer.JOURNAL OF CHEMICAL PHYSICS,131(4). |
| MLA | Yu, Zijun,et al."Ultraviolet photodissociation of C2F5I with a small and simple photofragment translational spectrometer".JOURNAL OF CHEMICAL PHYSICS 131.4(2009). |
入库方式： OAI收割
来源：化学研究所
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