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题名: Cluster-assisted multiple ionization of methyl iodide by a nanosecond laser: Influence of laser intensity on the kinetic energy and peak profile of multicharged ions
作者: Wen, LH;  Li, HY;  Luo, XL;  Niu, DM;  Xiao, X;  Wang, B;  Liang, F;  Hou, KY;  Shao, SY
关键词: methyl iodide ;  multiple ionization ;  cluster ;  space charge effect
刊名: CHEMICAL PHYSICS
发表日期: 2006-03-20
DOI: 10.1016/j.chemphys.2005.09.006
卷: 322, 期:3, 页:360-365
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The dependences of kinetic energies and peak profiles of multicharged ions of Iq+ (q = 2-3) and C2+ on the laser intensity have been Studied in detail by time-of-flight mass spectrometry, those multicharged ions are produced by irradiation of methyl iodide cluster beam with a nanosecond 532 nm Nd-YAG laser. Our experiments show that the kinetic energies released of multicharged ions increase linearly with the laser intensity in the range of 3 x 10(9)-2 x 10(11) W/cm(2). The peaks of multicharged ions are split to forward ions and backward ions, and the ratio of the backward ions to forward ions decreases exponentially with laser intensity. The decreasing of backward ions is probably due to Coulomb scattering by the heavier I+ ions when they turn around through the laser focus point. The linear dependence of kinetic energy of multicharged ions on laser intensity is interpreted by the ionization mechanism, in which the laser induced inverse bremsstrahlung heating of electron is the rate-limiting step. (c) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: X-RAY-EMISSION ;  COULOMB EXPLOSION ;  MULTIPHOTON IONIZATION ;  MOLECULAR CLUSTERS ;  ELECTRON DYNAMICS ;  NUCLEAR-DYNAMICS ;  ATOMIC CLUSTERS ;  GENERATION ;  FIELDS ;  PULSES
语种: 英语
WOS记录号: WOS:000236318200014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140264
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, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Techol, Hefei 230031, Peoples R China

Recommended Citation:
Wen, LH,Li, HY,Luo, XL,et al. Cluster-assisted multiple ionization of methyl iodide by a nanosecond laser: Influence of laser intensity on the kinetic energy and peak profile of multicharged ions[J]. CHEMICAL PHYSICS,2006,322(3):360-365.
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