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SPECTROSCOPIC DETERMINATION OF THE BRANCHING RATIOS OF DISSOCIATIVE RECOMBINATION REACTIONS

解离重组反应支化率的光谱测定

基本信息

批准号：
06403005
负责人：
AMANO Takayoshi
金额：
$ 14.85万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The apparatus consists of an ion source, ion optics, a mass spectrometer, an ion-electron collision chamber, a low-temperature gas matrix, and an infrared Fourier transform spectrometer. During the two-year period of this project, open-type mass spectrometer and a matrix formation apparatus were implemented together with the IR spectrometer, and checked the overall performance of the system. A corona discharge supersonic expansion nozzle, and an ion selection velocity filter have been installed in a custom made chamber. The whole system is now at near completion. Manufacturing and testing a low-energy electron beam generator, however, is somewhat delayd, and at the present stage, its design has been finalized. In order to determine the branching ratio of dissociative recombination reactions between ions and electrons, it is imperative to measure the concentration of the product neutral molecules. Our first target is the dissociative recombination of HCNH^+ and the primary neutrals are HCN and HNC.However, currently the transition dipole moments of HNC are not known. We recorded the v_1 and v_3 bands of HNC using a Fourier transform IR spectrometer and found that the Herman-Wallis effect is large enough to determine the transition dipole monent for the v_1 band, and a preliminary vale for the transition dipole moment has been obtained. In summary, this field of spectroscopic determination of dissociative recombination branching ratio has been quite uncultivated despite its extreme importance for understanding interstellar chemical and physical processes. We certainly continue perfecting the experimental setups and will provide essential information to our community.

该装置由离子源、离子光学、质谱仪、离子-电子碰撞室、低温气体基体和红外傅里叶变换光谱仪组成。在该项目的两年期间，开放式质谱仪和基质形成装置与红外光谱仪一起实施，并检查系统的整体性能。在自制的电离室中安装了电晕放电超音速膨胀喷嘴和离子选择速度过滤器。整个系统现已接近完成。然而，低能电子束发生器的制造和测试有些延迟，在现阶段，它的设计已经完成。为了确定离子和电子之间解离复合反应的分支比，必须测量产物中性分子的浓度。我们的第一个目标是HCNH^+的解离复合，初级中性粒子是HCN和HNC，但目前HNC的跃迁偶极矩还不清楚。我们用傅里叶变换红外光谱仪记录了HNC的v_1和v_3带，发现Herman-Wallis效应足够大，可以确定v_1带的跃迁偶极矩，并得到了跃迁偶极矩的初步值。总而言之，光谱测定解离复合分支比的这一领域尽管对理解星际化学和物理过程极其重要，但却相当缺乏研究。我们当然会继续完善实验设置，并将为我们的社区提供必要的信息。