Nuclear motion and dissociation dynamics of core-excited molecules

核心激发分子的核运动和解离动力学

基本信息

  • 批准号:
    11440120
  • 负责人:
  • 金额:
    $ 9.6万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1999
  • 资助国家:
    日本
  • 起止时间:
    1999 至 2001
  • 项目状态:
    已结题

项目摘要

Nuclear motion and dissociation dynamics of core-excited molecules have been investigated using monochromatic soft X-rays obtained from the high-resolution monchromators installed in the synchrotron radiation facilities. Major results can be summarized as follows.(1) Vivrational structure have been resolved in the O 1s excitation spectrum of H_2O molecules for the first time. It was found that the O 1s^<-1> 2b_2 excited state has a potential minimum and that H_2^+ ion formation after the Auger decay increases with the increase in energy stored in the O 1s^<-1> 2b_2 excited state. It was also found that the nuclear motion of the Auger final 1b_2^<-1> state can be controlled significantly by tuning the excitation energy within the 1s→2b_2 resonance.(2) The doubly-degenerate core-excited II state of CO_2 splits into two due to static Renner-Teller effect. The linear and bent geometries for the B_1 and A_1 Renner-Teller pair states have been probed directly and separately, using the triple-ion-coincidence momentum imaging technique and focusing on the dependence of the measured quantities on the polarization of the incident light. Furthermore dynamical coupling between B_1 and A_1 state were investigated using symmetry-resolved, vibrationally-resolved excitation spectra.(3) The out-of-plane nuclear motion of the BF_3 planar molecule in D_<3h> symmetry induced via B 1s to 2a_2" excitation has been probed by angle-resolved ion yield spectroscopy, resonant Auger electron spectroscopy and quadruple-ion coincidence momentum imaging technique.(4) The asymmetric nuclear motion of the CF_4 and SiF_4 molecule in T_d symmetry induced via F 1s to 2t_2" excitation has been investigated by measuring the anisotropic fragmentation of the F+ ion and the Doppler-shifted anistoropic Auger emission from thedeparting F atom produced via the ultrafast molecular fragmentation of the molecule after the core-excitation but before the Auger decay.
利用安装在同步辐射装置上的高分辨单色器获得的单色软X射线研究了核激发分子的核运动和离解动力学。主要结果可归纳如下。(1)首次在H_2O分子的O 1 s激发光谱中分辨出了活态结构。发现O 1s^2b_2<-1>激发态有一个势能极小值,随着O 1s^2b_2激发态能量的增加,俄歇衰变后H_2^+离子的生成量增加<-1>。研究还发现,在<-1>1 s →2b_2共振范围内调节激发能,可以有效地控制俄歇末态1b_2^的核运动。(2)CO_2的双简并核激发II态由于静态Renner-Teller效应而分裂为两个。利用三重离子符合动量成像技术,分别对B_1和A_1 Renner-Teller对态的线性和弯曲几何结构进行了直接探测,重点研究了所测得的物理量对入射光偏振态的依赖关系。此外,还利用振动分辨和振动分辨激发光谱研究了B_1和A_1态之间的动力学耦合。(3)利用<3h>角分辨离子产额谱、共振俄歇电子能谱和四离子符合动量成像技术,研究了B 1 s到2a 2”激发引起的D对称BF 3平面分子的面外核运动。(4)本文通过测量F ~+离子的各向异性碎裂和F原子在核激发后俄歇衰变前的超快分子碎裂产生的多普勒频移各向异性俄歇发射,研究了T_d对称的CF_4和SiF_4分子在F1 s到2t_2 ~”激发下的非对称核运动。

项目成果

期刊论文数量(94)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Kiyoshi Ueda: "Nuclear motion and symmetry breaking of core-excited polyatomic molecules..."AIP Conference proceedings. 500. 223 (2000)
Kiyoshi Ueda:“核心激发多原子分子的核运动和对称性破缺……”AIP 会议记录。
  • DOI:
  • 发表时间:
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    0
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Kiyoshi Ueda: "Angle-resolved electron and ion spectroscopy apparatus on the soft X-ray photochemistry beamline BL27SU at SPring-8"Nuclear Instrum. Methods A. 467-468. 1502-1504 (2001)
Kiyoshi Ueda:“SPring-8 核仪器的软 X 射线光化学束线 BL27SU 上的角分辨电子和离子光谱仪。
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    0
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Kazumasa Okada: "High-resolution angle-resolved ion-yield measurements of H_2O and D_2O in the region of O 1s to Rydberg transitions"Chemical Physics Letters. 326. 314 (2000)
Kazumasa Okada:“O 1s 到里德堡跃迁区域中 H_2O 和 D_2O 的高分辨率角分辨离子产额测量”《化学物理快报》。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
K,Ueda: "Dynamical Auger emission induced by multi-state vibronic coupling in the core-excited states of the BCl_3 molecule"Physical Review Letters. 85. 3129-3132 (2000)
K,Ueda:“BCl_3 分子核心激发态下多态振动耦合引起的动态俄歇发射”物理评论快报。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
A.Hiraya: "H_2^+ formation from H_2O^+ mediated by the core-excitation induced nuclear motion in H_2O"Physical Review A. (印刷中). (2001)
A. Hiraya:“由 H_2O^+ 介导的 H_2O^+ 形成 H_2^+”《物理评论 A》(出版中)。
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    0
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UEDA Kiyoshi其他文献

UEDA Kiyoshi的其他文献

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{{ truncateString('UEDA Kiyoshi', 18)}}的其他基金

Data management method of a session control server continuing communication even at the time of disaster
灾害发生时也能继续通信的会话控制服务器的数据管理方法
  • 批准号:
    26880021
  • 财政年份:
    2014
  • 资助金额:
    $ 9.6万
  • 项目类别:
    Grant-in-Aid for Research Activity Start-up
Charge and energy transfer in two-composite clusters following multiple ionization
多次电离后两种复合团簇中的电荷和能量转移
  • 批准号:
    21244062
  • 财政年份:
    2009
  • 资助金额:
    $ 9.6万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Core level photoelectron spectroscopy of molecules: resonance, quantum interference, nonadiabatic effect and determination of the geometry of core ionized state
分子核心级光电子能谱:共振、量子干涉、非绝热效应和核心电离态几何形状的确定
  • 批准号:
    18340116
  • 财政年份:
    2006
  • 资助金额:
    $ 9.6万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on molecular dissociation governed by femtoseconds dynamics of core-excited molecules
核激发分子飞秒动力学控制的分子解离研究
  • 批准号:
    15540379
  • 财政年份:
    2003
  • 资助金额:
    $ 9.6万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Anisotropy and relaxation dynamics in core-excited small molecules
核心激发小分子的各向异性和弛豫动力学
  • 批准号:
    08454108
  • 财政年份:
    1996
  • 资助金额:
    $ 9.6万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study of Acidic Actin of Nuclear Skeleton
核骨架酸性肌动蛋白的研究
  • 批准号:
    61570122
  • 财政年份:
    1986
  • 资助金额:
    $ 9.6万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
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