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题名: Ionization and dissociation of CH3I in intense laser field
作者: Liu, Hongtao;  Yang, Zheng;  Gao, Zhen;  Tang, Zichao
通讯作者: 唐紫超
刊名: JOURNAL OF CHEMICAL PHYSICS
发表日期: 2007-01-28
DOI: 10.1063/1.2424703
卷: 126, 期:4, 页:044316-1-044316-9
收录类别: SCI
文章类型: Article
部门归属: 11
项目归属: 1102
产权排名: 2;4
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 ionization-dissociation of methyl iodide in intense laser field has been studied using a reflection time-of-flight mass spectrometry (RTOF-MS), at a laser intensity of <= 6.6x10(14) W/cm(2), lambda=798 nm, and a pulse width of 180 fs. With the high resolution of RTOF-MS, the fragment ions with the same M/z but from different dissociation channels are resolved in the mass spectra, and the kinetic energy releases (KERs) of the fragment ions such as Iq+ (q=1-6), CHm+ (m=0-3), C2+, and C3+ are measured. It is found that the KERs of the fragment ions are independent of the laser intensity. The fragments CH3+ and I+ with very low KERs (< 1 eV for CH3+ and < 0.07 eV for I+) are assigned to be produced by the multiphoton dissociation of CH3I+. For the fragments CH3+ and I+ from CH3I2+, they are produced by the Coulomb explosion of CH3I2+ with the interaction from the covalent force of the remaining valence electrons. The split of the KER of the fragments produced from CH3I2+ dissociation is observed experimentally and explained with the energy split of I+(P-3(2)) and I+(P-3(0,1)). The dissociation CH3I3+-> CH3++I2+ is caused by Coulomb explosion. The valid charge distance R-c between I2+ and CH3+, at which enhanced ionization of methyl iodide occurs, is obtained to be 3.7 A by the measurements of the KERs of the fragments CH3+ and I2+. For the CH3In+ (n >= 3), the KERs of the fragment ions CH3p+ and Iq+ are attributed to the Coulomb repulsion between CH3p+ and Iq+ from R-c approximate to 3.7 A. The dissociation of the fragment CH3+ is also discussed. By the enhanced ionization mechanism and using the measured KER of Iq+, all the possible Coulomb explosion channels are identified. By comparing the abundance of fragment ions in mass spectrum, it is found that the asymmetric dissociation channels with more charges on iodine, q > p, are the dominant channels. (c) 2007 American Institute of Physics.
关键词[WOS]: COULOMB EXPLOSION ;  TRANSITION-STATES ;  SMALL MOLECULES ;  DYNAMICS ;  PULSES ;  ION ;  PICOSECOND ;  SPECTROMETER ;  MECHANISMS ;  ALIGNMENT
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000243891100028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99927
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, Ctr Mol Sci, State Key Lab Mol React Dynam, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
Liu, Hongtao,Yang, Zheng,Gao, Zhen,et al. Ionization and dissociation of CH3I in intense laser field[J]. JOURNAL OF CHEMICAL PHYSICS,2007,126(4):044316-1-044316-9.
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