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Ultraviolet photodissociation of C2F5I with a small and simple photofragment translational spectrometer
Yu, Zijun1,2; Xu, Xiling1,2; Cheng, Min1,2; Yu, Dan1,2; Du, Yikui1; Zhu, Qihe1
KeywordMolecule-photon Collisions Organic Compounds Photodissociation Potential Energy Surfaces Rotational-vibrational Energy Transfer
Source PublicationJOURNAL OF CHEMICAL PHYSICS
2009-07-28
DOI10.1063/1.3186737
Volume131Issue:4
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectPhysics, Atomic, Molecular & Chemical
WOS Research AreaPhysics
WOS Keyword248 NM ; UV-PHOTODISSOCIATION ; ALKYL IODIDES ; RECOIL ANISOTROPY ; ENERGY DEPENDENCE ; MOLECULAR-BEAMS ; AB-INITIO ; CF3I ; DYNAMICS ; SPECTROSCOPY
AbstractPhotodissociation 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.
Language英语
WOS IDWOS:000268613700054
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/141469
Collection中国科学院大连化学物理研究所
Affiliation1.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
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).
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