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Photodissociation dynamics of CH2I2 molecules in the ultraviolet range studied by ion imaging
Xu, HF; Guo, Y; Liu, SL; Ma, XX; Dai, DX; Sha, GH
刊名JOURNAL OF CHEMICAL PHYSICS
2002-09-22
DOI10.1063/1.1503316
117期:12页:5722-5729
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
关键词[WOS]MULTIPHOTON IONIZATION ; METHYLENE IODIDE ; PHOTOELECTRON ; SPECTROSCOPY ; NM ; OXYGEN ; CH3I
英文摘要The photodissociation dynamics of diiodomethane molecules has been investigated in the wavelength range of 277-305 nm by an ion imaging spectrometer operated under optimal conditions for velocity mapping, where the ions were generated from (2+1) multiphoton ionization of I(P-2(3/2)) and I*(P-2(1/2)) fragments with the same laser as that to dissociate the parent molecules. The speed and angular distributions of I* and I fragments were determined from the images. The translational energy distribution of I*(P-2(1/2)) fragment consists of a single Gaussian component (named G*), while that of I(P-2(3/2)) consists of two Gaussian components (named G1 and G2). It was found that the component G* and G2 show similar angular distributions and similar fragmentation energy partitioning ratios, indicating that these two components originate from dissociation at the same electronically excited state, while the component G1 is from another state. Three fragmentation pathways were employed to account for the experimental observations, the adiabatic dissociation from the 1B(1) state to form I(P-2(3/2)) with component G1, the adiabatic dissociation from the 2B(1) state to form I*(P-2(1/2)) with component G*, and the nonadiabatic dissociation from the 2B(1) state caused by coupling with the higher 2A(1) state to form I(P-2(3/2)) with component G2. (C) 2002 American Institute of Physics.
语种英语
WOS记录号WOS:000177825500022
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/139090
专题中国科学院大连化学物理研究所
作者单位1.Univ Sci & Technol China, Open Lab Bond Select Chem, Dept Chem Phys, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
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Xu, HF,Guo, Y,Liu, SL,et al. Photodissociation dynamics of CH2I2 molecules in the ultraviolet range studied by ion imaging[J]. JOURNAL OF CHEMICAL PHYSICS,2002,117(12):5722-5729.
APA Xu, HF,Guo, Y,Liu, SL,Ma, XX,Dai, DX,&Sha, GH.(2002).Photodissociation dynamics of CH2I2 molecules in the ultraviolet range studied by ion imaging.JOURNAL OF CHEMICAL PHYSICS,117(12),5722-5729.
MLA Xu, HF,et al."Photodissociation dynamics of CH2I2 molecules in the ultraviolet range studied by ion imaging".JOURNAL OF CHEMICAL PHYSICS 117.12(2002):5722-5729.
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