High resolution spectroscopy of radical complexes in the visible and ultraviolet regions, and determination of their intermolecular potentials

可见光和紫外区自由基配合物的高分辨率光谱及其分子间势的测定

基本信息

批准号：
05640559
负责人：
ENDO Yasuki
金额：
$ 1.47万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

The present research project intended to study radical complexes by means of a laser induced fluorescence spectroscopic technique using a Nd-YAG pumped tunable dye laser system combined with a pulsed-discharge-nozzle. Especially, by utilizing a frequency doubled dye laser we were able to observe LIF spectra of a rare gas-OH complex in the near UV region, which has been studied extensively. We have produced the OH radical in the supersonic jet by discharging water diluted in Ar.Spectra of Ar-OH were observed with a good signal to noise ratio between much stronger OH monomer lines, by carefully adjusting the nozzle dimensions and discharge conditions. Since we have confirmed that our system is capable to observe LIF spectra of a radical complex, we have started to search a new system by discharging various parent molecules diluted in rare gases. So far, we were able to observe monomer radicals C_2, C_3, CN,CCN etc. fairly strongly, and are continuing the search for spectra of complexes containing these short lived radical species.Along with these experimental studies, we have developed a program system to analyze the large amplitude motion of the radical complexs, where energy levels are far more complicated than those of complexes with closed shell molecules, since the radicals usually have an unpaired electron and its spin and/or orbital angular momenta couple with the large amplitude motion. We were able to explain the observed spectral patterns in the case of the rare gas-OH complexes. Especially, we have accurately treated the hyperfine interaction under the large amplitude motion, and have shown that it is possible to derive information for the intermoleclular potential from the observed hyperfine patterns.

本研究项目旨在通过激光诱导的荧光光谱技术研究自由基复合物，并使用ND-YAG泵送可调的染料激光系统与脉冲分离式 - 无嘴嘴相结合。特别是，通过利用频率加倍的染料激光器，我们能够观察到近紫外线区域的稀有气体oH复合物的LIF光谱，该光谱已被广泛研究。我们通过在AR-OH的AR-OH谱中排放水的水，通过仔细调节喷嘴尺寸和放电条件，在AR-OH的AR-OH谱中稀释水的噪声比良好，从而产生了超音速射流的OH自由基。由于我们已经确认我们的系统能够观察到根治性复合物的LIF光谱，因此我们开始通过排出在稀有气体中稀释的各种父分子来搜索新系统。 So far, we were able to observe monomer radicals C_2, C_3, CN,CCN etc. fairly strongly, and are continuing the search for spectra of complexes containing these short lived radical species.Along with these experimental studies, we have developed a program system to analyze the large amplitude motion of the radical complexs, where energy levels are far more complicated than those of complexes with closed shell molecules, since the radicals usually have an未配对的电子及其自旋和/或轨道角动量夫妇，具有较大的振幅运动。在罕见的气体oH复合物的情况下，我们能够解释观察到的光谱模式。尤其是，我们已经在较大的振幅运动下准确处理了超精细的相互作用，并表明可以从观察到的超细模式中得出信息中电位的信息。