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题名: Photodissociation dynamics of CH2I2 molecules in the ultraviolet range studied by ion imaging
作者: Xu, HF;  Guo, Y;  Liu, SL;  Ma, XX;  Dai, DX;  Sha, GH
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2002-09-22
DOI: 10.1063/1.1503316
卷: 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
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.
关键词[WOS]: MULTIPHOTON IONIZATION ;  METHYLENE IODIDE ;  PHOTOELECTRON ;  SPECTROSCOPY ;  NM ;  OXYGEN ;  CH3I
语种: 英语
WOS记录号: WOS:000177825500022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139090
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.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

Recommended Citation:
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.
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