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题名: Ultraviolet photodissociation of C2F5I with a small and simple photofragment translational spectrometer
作者: Yu, Zijun1, 2;  Xu, Xiling1, 2;  Cheng, Min1, 2;  Yu, Dan1, 2;  Du, Yikui1;  Zhu, Qihe1
关键词: molecule-photon collisions ;  organic compounds ;  photodissociation ;  potential energy surfaces ;  rotational-vibrational energy transfer
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2009-07-28
DOI: 10.1063/1.3186737
卷: 131, 期:4
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
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.
关键词[WOS]: 248 NM ;  UV-PHOTODISSOCIATION ;  ALKYL IODIDES ;  RECOIL ANISOTROPY ;  ENERGY DEPENDENCE ;  MOLECULAR-BEAMS ;  AB-INITIO ;  CF3I ;  DYNAMICS ;  SPECTROSCOPY
语种: 英语
WOS记录号: WOS:000268613700054
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141469
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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).
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