Observation of Chemical Reaction in Intense Laser Fields by Ultra-short Pulsed Electron Diffraction

超短脉冲电子衍射观察强激光场中的化学反应

基本信息

  • 批准号:
    13304048
  • 负责人:
  • 金额:
    $ 34.03万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2003
  • 项目状态:
    已结题

项目摘要

In this research project, ultra-short electron pulses were generated and dynamical behavior of molecules in intense laser fields was investigated. Our achievements are summarized as follows.(1)A molecular alignment process of CS_2 in an intense ns laser field (0.64 TW/cm^2) was observed as an anisotropic 2D diffraction image by ns pulsed electron diffraction measurements. From the analysis of the obtained anisotropic image, <<cos^2θ>> = 0.36 was derived as a spatio-temporal averaged value. The extent of the alignment was interpreted theoretically by taking into account the rotational temperature, T_R=10 K, and the polarizabilities of CS_2.(2)A high-sensitive detection system, equipped with an image intensifier detector and a cooled slow-scan CCD camera, achieve high sensitive detection of scattered electrons. The weak diffraction signals measured by picosecond electron pulses (the number of electrons per pulse ≦ 10^4) were detected with a high signal-to-noise ratio using this new detection system.(3)The ultrafast structural deformation of CS_2 in an intense ns laser field (〜10^<12> W/cm^2) was probed by the ps electron diffraction method. It was interpreted that this structural change reflects the nuclear dynamics on the dressed potential energy surface formed by the light-induced strong coupling among the electronic states of CS_2 in an intense laser field.(4)A numerical simulation of generation and propagation of electron packets was performed to examine the conditions required for the generation of ultra-short (〜 1 ps) electron pulses. It was found that ultrashort electron pulses whose temporal width is shorter than 1 ps could be generated when the number of electrons is below 10^3.
本研究利用超短电子脉冲的产生,研究了分子在强激光场中的动力学行为。我们的成就总结如下。(1)通过脉冲电子衍射测量,观察了CS_2在强激光场(0.64 TW/cm^2)下的分子取向过程,得到了各向异性的二维衍射图像。对得到的各向异性图像进行分析,得到<<cos^2θ>> = 0.36作为时空平均值。考虑了旋转温度、T_R=10 K和CS_2的极化率,理论上解释了取向的程度。(2)高灵敏度探测系统,配备图像增强探测器和冷却慢扫描CCD相机,实现对散射电子的高灵敏度探测。该系统能以高信噪比检测以皮秒电子脉冲(每脉冲电子数≦10^4)测量的弱衍射信号。(3)用ps电子衍射法探测了CS_2在强ns激光场(~ 10^<12> W/cm^2)下的超快结构变形。这一结构变化反映了CS_2在强激光场下电子态之间的强耦合所形成的修饰势能面上的核动力学。(4)对电子包的产生和传播进行了数值模拟,考察了产生超短(~ 1ps)电子脉冲所需的条件。发现当电子数小于10^3时,可以产生时间宽度小于1 ps的超短电子脉冲。

项目成果

期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M.Kono: "Photofragment emission yield spectroscopy of acetylene in the D^1Π_u, E^1A and F^1Σ_u^+ states by vacuum ultraviolet and infrared vacuum ultraviolet double-resonance laser excitations"J.Chem.Phys.. 117. 1040-1046 (2002)
M.Kono:“真空紫外和红外真空紫外双共振激光激发乙炔在 D^1Π_u、E^1A 和 F^1Σ_u^+ 态的光碎片发射产率光谱”J.Chem.Phys. 117. 1040 -1046 (2002)
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    0
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K.Hoshina: "Alignment of CS_2 in intense nano-second laser fields probed by pulsed gas electron diffraction"J.Chem.Phys.. 118. 6211-6221 (2003)
K.Hoshina:“脉冲气体电子衍射探测的强纳秒激光场中 CS_2 的排列”J.Chem.Phys.. 118. 6211-6221 (2003)
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    0
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T.Amano: "New vibrational force-field expansion of the coupled linear benders : Application to the X state of acetylene"Chem.Phys.Lett.. 375. 576-582 (2003)
T.Amano:“耦合线性弯曲器的新振动力场扩展:应用于乙炔的 X 态”Chem.Phys.Lett.. 375. 576-582 (2003)
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    0
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R.Itakura: "Dissociative ionization of ethanol in chirped intense laser fields"J.Chem.Phys.. 119. 4179-4186 (2003)
R.Itakura:“啁啾强激光场中乙醇的解离电离”J.Chem.Phys.. 119. 4179-4186 (2003)
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    0
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Kennosuke Hoshina: "Direct observation of molecular alignment in an intense laser field by pulsed gas electron diffraction I : observation of anisotropic diffraction image"Chem. Phys. Lett.. 353. 27-32 (2002)
Kennosuke Hoshina:“通过脉冲气体电子衍射直接观察强激光场中的分子排列 I:各向异性衍射图像的观察”Chem.
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YAMANOUCHI Kaoru其他文献

YAMANOUCHI Kaoru的其他文献

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{{ truncateString('YAMANOUCHI Kaoru', 18)}}的其他基金

Determination of geometrical structures of molecules by ultrafast gas electron diffraction and gas X ray diffraction
通过超快气体电子衍射和气体 X 射线衍射测定分子的几何结构
  • 批准号:
    24245003
  • 财政年份:
    2012
  • 资助金额:
    $ 34.03万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Ultrafast hydrogen migration
超快氢迁移
  • 批准号:
    19002006
  • 财政年份:
    2007
  • 资助金额:
    $ 34.03万
  • 项目类别:
    Grant-in-Aid for Specially Promoted Research
Control of Molecules in Intense Laser Fields
强激光场中的分子控制
  • 批准号:
    14077101
  • 财政年份:
    2002
  • 资助金额:
    $ 34.03万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
Vibrational Dynamics of Mass-Selected Ion Clusters as Studied by Double Resonance Laser Spectroscopy
双共振激光光谱研究质量选择离子簇的振动动力学
  • 批准号:
    05453016
  • 财政年份:
    1993
  • 资助金额:
    $ 34.03万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

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短波长强激光场中的多光子多重电离机制
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强激光场下电子动力学的第一性原理计算
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