Reaction Dynamics of Metastable Atom with Molecules in Higher Energy Region

亚稳态原子与高能区分子的反应动力学

• 批准号: 07454149
• 负责人: TOKUE Ikuo
• 金额: $ 4.54万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454149/
• 关键词: Emission cross section; Dissociation process; Penning ionization; Interaction potential; Collision energy; Metastable atom; 準安定励起原子; 発光スペクトル; ハ-プーン機構; 電子交換

It has been the subject of this study to clarify reaction dynamics in collisions of metastable atoms with target molecules in higher energy region using photoemission spectroscopy. We have developed new techniques concerning (1) the method measuring the dependence of emission cross sections for excited species on the collision energy and (2) the high resolution spectroscopy of emission spectra by using a liquid nitrogen cooled CCD detector. Emission cross sections and rotational distributions of products have been measured by means of these techniques. The interaction potentials between the metastable atoms and the target molecules and the reaction dynamics of dissociation and ionization have been clarified as follows :1.The collision-energy dependence of the emission cross sections for species produced by the collision of metastable atoms and target molecules were studied only for the N_2^+ (B-X) system produced from N_2. In this study, we have developed a metastable beam source which … More can vary the average kinetic energy of metastable atoms in the 120-200 meV range. Although the kinetic energy distribution of the beam is relatively broad, this beam source has a intense flux, which can apply to a lot of target molecules. In the term of this project, we have clarified the dynamics of dissociation and ionization of CH_3X (X=H,Cl, Br, I), CCl_3X (X=H,F,Cl, Br, I), SiCl_4, GeCl_4 by the collisions with He (2^3S).2.The combination of a liquid nitrogen cooled CCD detector and a spectrometer has been developed in order to measure emission spectra with a higher resolution. This optical detection system does not need to calibrate the fluctuation both the metastable beam flux and the pressure of the target molecule at the collision region. By calibrating the sensitivity for each pixel of the detector, this system can obtain a subject spectrum with a good S/N ratio in a shorter time than that measured using a photomultiplier. In the term of this project, we have measured the dependences of the rotational populations for CO^+ (A,B) and N_2^+ (B) on the collision energy, and have clarified the collision dynamics of the He (2^3S) Penning ionization of CO and N_2. Less

本研究利用光电子能谱技术来研究亚稳态原子与高能靶分子碰撞的反应动力学。我们发展了新的技术，包括（1）测量激发态的发射截面与碰撞能量的关系的方法和（2）用液氮冷却的CCD探测器测量发射光谱的高分辨率光谱学。利用这些技术测量了产物的发射截面和转动分布。1.仅对N_2产生的N_2^+（B-X）体系，研究了亚稳原子与靶分子碰撞产生的物种的发射截面与碰撞能量的关系。在这项研究中，我们开发了一个亚稳态光束源， ...更多信息 可以在120-200 meV范围内改变亚稳原子的平均动能。虽然束流的动能分布较宽，但该束源具有较强的通量，可以适用于许多目标分子。在本项目期间，我们研究了CH_3X（X=H，Cl，Br，I），CCl_3X（X=H，F，Cl，Br，I），SiCl_4，GeCl_4等分子与He（2^3S）碰撞的离解和电离动力学。该光学检测系统不需要校准亚稳态光束通量和目标分子在碰撞区域的压力的波动。通过对探测器每个像素的灵敏度进行校准，该系统可以在比光电倍增管测量更短的时间内获得具有良好信噪比的主题光谱。在本项目期间，我们测量了CO^+（A，B）和N_2^+（B）的转动布居数与碰撞能的关系，阐明了CO和N_2的He（2^3S）Penning电离的碰撞动力学。少

项目成果

I. Tokue 他2名: "Photoemission Cross Sections for CH Radicals Produced by Collisions of He (2^3S) Atoms with CH_3X (X=H, Cl, Br, I)" J. Chem. Phys.106(印刷中). (1997)

I. Tokue 和另外 2 人：“He (2^3S) 原子与 CH_3X (X=H、Cl、Br、I) 碰撞产生的 CH 自由基的光电发射截面”J. Chem.106（出版中） (1997)

I. Tokue 他3名: "Branching Ratios of Excited Sn I States Produced by Collisions of He (2^3SS) Atom with SnCl_4 and Sn (CH_3) 4" Bull. Chem. Soc. Jpn.69. 2815-2820 (1996)

I. Tokue 和其他 3 人：“He (2^3SS) 原子与 SnCl_4 和 Sn (CH_3) 4 碰撞产生的激发 Sn I 态的分支比”，Soc Jpn.69。 ）

徳江郁雄: "Branching ratios of excited Sn I states produced by collisions of He(2^3S) atom with SnCl_4 and Sn(CH_3)_4" J. Phys. Chem.(印刷中). (1996)

Ikuo Tokue：“He(2^3S) 原子与 SnCl_4 和 Sn(CH_3)_4 碰撞产生的激发 Sn I 态的分支比”J. Phys (1996)。

I. Tokue 他2名: "Rotational Excitations of Ions Produced by the He (2^3S) Penning lonization of CO and N_2" Chem. Phys. Letters. (印刷中). (1997)

I. Tokue 和其他 2 人：“CO 和 N_2 的 He (2^3S) 彭宁离子化产生的离子的旋转激发”，《物理快报》（1997 年）。

I.Tokue, Y.Sakai, M.Kobayashi, and K.Yamasaki: "Branching Ratios of Excited Sn I States Produced by Collisions of He (2^3S) Atom with SnCl_4 and Sn (CH_3) _4" Bull.Chem.Soc.Jpn.69,10. 2815-2820 (1996)

I.Tokue、Y.Sakai、M.Kobayashi 和 K.Yamasaki：“He (2^3S) 原子与 SnCl_4 和 Sn (CH_3) _4 碰撞产生的激发 Sn I 态的分支比” Bull.Chem.Soc