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 |
| 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. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | physics, atomic, molecular & chemical |
| 研究领域[WOS] | physics |
| 关键词[WOS] | 248 nm ; uv-photodissociation ; alkyl iodides ; recoil anisotropy ; energy dependence ; molecular-beams ; ab-initio ; cf3i ; dynamics ; spectroscopy |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268613700054 |
| 公开日期 | 2015-11-17 |
| 源URL | [http://159.226.238.44/handle/321008/141469]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 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：大连化学物理研究所
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