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High precision terahertz spectroscopy focused on the detection of weak transions

高精度太赫兹光谱专注于弱跃迁的检测

基本信息

批准号：
18540391
负责人：
MATSUSHIMA Fusakazu
金额：
$ 2.43万
依托单位：
University of Toyama
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18540391/
关键词：
far-infrared terahertz molecular spectroscopy molecular ion

项目摘要

High precision spectroscopic measurements of molecular cations and anions which are very difficult to investigate were developed in the terahertz region. We successfully obtained the following results that play important roles in the development of molecular science.1) Spectral measurements of the rotational structure of OD- molecular anion.Rotational spectraof OD ion which is the deutrated species of OH previously measured by us were investigated to extend this series of works. Precise frequencies of the four new pure-rotational lines were obtained by using Tunable Far-infrared spectrometer. The high precision of the measured frequencies enabled us to improve the rotational constants previously obtained from IR spectroscopic works by two orders of magnitudes. An analysis using Dunham coefficients are also in progress. The drafts of the paper reporting the present results are in preparation.2) Measurements of the rotational line frequencies of H2D^+ and D_2H^+.H_2D^+ and D_2H^+. is the … More isotopic species of H_3^+ which is supposed to be the key species in the study of the chemical history of the space. We measured the frequencies of some of the pure rotational lines more than ten years ago. We now remeasure the frequencies of the rotational lines, and extend the measurements to more lines which are in the observable region of our spectrometer. The measurement is still in progress and in preparation to submit.3) Improvements of the tunable far-infrared spectrometer to adopt new type of sample cell.A discharge sample cell using the extended negative glow discharge has been proved to be effective in the investigation of molecular cations by preceding researchers. It can generate more ions in the glow discharge region extended by applying external magnetic field. We improved our sample cell to adopt this type of discharge. Also, new power supply and mass flow controller were prepared to keep the discharge stable enough to perform the precise measurements. The performance of the spectrometer was confirmed by observing the rotational lines of N_2H^+ ion.. The spectrometer will be effective in the future measurements of molecular cations. Less

在太赫兹波段发展了分子阳离子和阴离子的高精度光谱测量，这是非常困难的调查。我们成功地获得了以下对分子科学发展具有重要意义的结果：1）OD-分子阴离子转动结构的光谱测量作为对这一系列工作的扩展，我们对先前测量到的OH的氘代物种OD离子的转动光谱进行了研究。利用可调谐远红外光谱仪获得了四条新的纯转动谱线的精确频率。高精度的测量频率，使我们能够提高以前从红外光谱工作获得的旋转常数的两个数量级。使用Dunham系数的分析也在进行中。（2）H_2D ^+和D_2H ^+的转动谱线频率的测量。是 ...更多信息 H_3^+的同位素物种是研究空间化学史的关键物种。我们在十多年前测量了一些纯转动谱线的频率。我们现在重新测量旋转线的频率，并将测量扩展到我们的光谱仪可观察区域内的更多线。3）对可调谐远红外光谱仪进行改进，采用新型的样品池，利用负辉光放电的放电样品池已被证明是研究分子阳离子的有效方法。通过外加磁场的作用，可以使辉光放电区域扩大，产生更多的离子。我们改进了我们的样品池，以采用这种类型的放电。此外，新的电源和质量流量控制器准备，以保持足够稳定的放电进行精确的测量。通过对N_2H^+离子转动谱线的观测，证实了谱仪的性能。该谱仪将在未来的分子阳离子测量中发挥作用。少