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Production and dissociation dynamics of singly, doubly and triply charged molecularions

单电荷、双电荷和三电荷分子离子的产生和解离动力学

基本信息

批准号：
08640651
负责人：
MASUOKA Toshio
金额：
$ 1.41万
依托单位：
Osaka city University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640651/
关键词：
Double ionization Double ionization cross section Dissociation of molecular ion Fragment ions kinetic-energyrelease Triple coincidence Synchrotron radiation Anisotropic angular distribution 段面積 2価イオン化断面積電子相関

项目摘要

Single, double, and triple photoionization of molecules such as CO_2, SO_2, NO_2, N_2O,and CF_4 has been investigated by using a multi coincidence (plotoelectron-photoion, phototion-photoion, photoelectron-photoion-photoion coincidence) system installed at BL3A2, the UVSOR facility of the Institute for Molecular Science, Okazaki. The following are the interesting results obtained on the production and dissociation dynamics of singly, doubly, and triply charged positive molecular ions using synchrotron radiation.1.The ratio of double to single photoionization, and the single and double photoionization cross sections were determined for SO_2 and NO_2. This made possible to determine separately the ion branching rations of the precursors m^+ and m^<2+> at the excitation energy where the molecular and dissociative single and double photoionization takes place simultaneously.2. Kinetic-energy release in the dissociation of m^<2+> was investigated by analyzing the photoion-photoion coincidence spectra from the double photoionization threshold to 100 eV.The results show that a major fraction of double photoionization of small molecules at low energy is due to indirect processes such as the nonresonant (m^<**+>) and resonant (m^<****>) autoionization.3.The dissociation dynamics of NO^2+_ and N_<>O^<2+> was examined by using triple photoelectron-photoion-photoion coincidence (PEPIPICO) method. The PEPIPICO method is important is important to study three-body dissociations whether the dissociation is a simultaneous or sequential process.Anisotropic dissociation of CO^2+_ and SO^2+_ was examined. From the resultant asymmetry parameter beta, the symmetry involved in the transition has been elucidated.

本文用冈崎分子科学研究所BL 3A 2装置上的多重符合（光电-光离子、光离子-光离子、光电子-光离子-光离子符合）系统研究了CO_2、SO_2、NO_2、N_2O和CF_4等分子的单、双和三重光电离。以下是利用同步辐射对单、双、三电荷正分子离子的产生和解离动力学进行研究的有趣结果。1.测定了SO_2和NO_2的双与单光电离比以及单、双光电离截面。这使得在分子和离解单、双光电离同时发生的激发能下，分别测定前体m^+和m^<2+>的离子分支比成为可能。通过分析从双光电离阈值到100 eV的光离子-光离子符合谱，研究了m^<2+>解离过程中的动能释放.结果表明，在低能下，小分子的双光电离主要是由非共振（m^**+）和共振等间接过程引起的（m^<*>）自电离。3.用三重光电-光离子-光离子符合（PEPIPICO）方法研究了NO^2+和N_<>O^<2+>的解离动力学。PEPIPICO方法对于研究三体解离是同时解离还是顺序解离都是重要的，本文研究了CO^2+_2和SO^2+_2的各向异性解离。从由此产生的不对称参数β，在过渡中涉及的对称性已被阐明。