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题名: Ionization and Dissociation of Methyl Bromide in Intense Laser Field
作者: Yang Zheng1;  Liu Hong-Tao1;  Tang Zi-Chao2;  Gao Zhen1
关键词: Time-of-flight mass spectrometry ;  Intense laser field ;  Coulomb explosion ;  Multiphoton dissociation
刊名: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
发表日期: 2010-02-10
卷: 31, 期:2, 页:367-373
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Ionization-dissociation of methyl bromide in intense laser field was studied using home-built reflection time-of-flight mass spectrometer. Based on the relative high resolution of the RTOF-MS (M/Delta M > 2000), the Kinetic Energy Release (KER) of the fragment ions was measured. Multiphoton dissociation and Coulomb explosion mechanisms were used to explain the experimental results. Comparing with the result of methyl iodide in intense laser field, some differences are observed: (1) at the same laser field intensity, the highest charged fragment ion of methyl bromide was Br(3+), lower than I(6+) of methyl iodide; (2) the dehydrogenation channel was observed in the multiphoton dissociation or Coulomb explosion of methyl bromide, but was not observed in the case of methyl iodide; (3) HBr(+) was observed, but there was no similar channel in the case of methyl iodide; (4) for methyl bromide, the valid charge distance of Coulomb explosion increases with the product of p and q; while in the case of methyl iodide, the distance remained almost the same; (5) the producing channel of CH(m)(+) (m = 0, 1, 2) is different from the ionization-dissociation of methyl iodide in which the stepwise dissociation of CH(3)(+) was thought to be the main channel, CH(m)(+) (m = 0, 1, 2) of methyl bromide are mainly from the products of the direct dissociation of the dehydrogenated parent ions instead of the stepwise dissociation of CH(3)(+).
关键词[WOS]: ATOM ;  PHOTODISSOCIATION ;  MOLECULES ;  CH3BR ;  NM
语种: 英语
WOS记录号: WOS:000275476600030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141817
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, State Key Lab Mol React Dynam, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
Yang Zheng,Liu Hong-Tao,Tang Zi-Chao,et al. Ionization and Dissociation of Methyl Bromide in Intense Laser Field[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2010,31(2):367-373.
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