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题名: UV photodissociation dynamics of CH2I2 molecule
作者: Xu, HF;  Liu, SL;  Ma, XX;  Dai, DX;  Xie, JC;  Sha, GH
关键词: CH2I2 ;  ion-velocity-imaging ;  adaibatic and nonadiabatic dissociation
刊名: ACTA PHYSICA SINICA
发表日期: 2002-02-01
卷: 51, 期:2, 页:240-246
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Multidisciplinary
研究领域[WOS]: Physics
英文摘要: Photodissociation dynamics of CH2I2 moleculae was investigated at different wavelengths of 277 to 305nm by an ion imaging spectrometer operated under optimal conditions for velocity mapping, where the ions were generated from (2 + 1) resonance-enhanced ionization (REMPI) of the photofragments I(P-2(3/2)) and I* (P-2(1/2)) at the same wavelength as that of the photolysis UV laser. The released kinetic energies and the angular distributions of both fragments at different photolysis wavelengths were derived from the three-dimensional velocity images. It was found that the photofragment of CH2I radical was highly excited. About 80% of the total released energy deposits into internal freedom. This fact can be explained by the impulse model. A remarkable difference between the kinetic energy distributions of I(P-2(3/2)) and I* (P-2(1/2)) was found. The dissociation mechanism of the formation of both I(P-2(3/2)) and I* (P-2(1/2)) fragments is discussed in terms of anisotropy parameter and energy partition. The kinetic energy distributions of the I(P-2(3/2)) and I* (P-2(1/2)) fragments are determined by the adiabatic and nonadiabatic dissociation processes in the electronically excited states of CH2I2.
关键词[WOS]: METHYLENE IODIDE
语种: 英语
WOS记录号: WOS:000173710400008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139047
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, Dept Chem Phys, Open Lab Bond Select Chem, Hefei 230026, 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,Liu, SL,Ma, XX,et al. UV photodissociation dynamics of CH2I2 molecule[J]. ACTA PHYSICA SINICA,2002,51(2):240-246.
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