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

我们成功地在太赫兹区域开发了难以研究的分子阳离子和阴离子的高精度光谱测量，这些结果在分子科学的发展中发挥了重要作用。1）OD-旋转结构的光谱测量。研究了我们先前测量的 OH 氘化物质 OD 离子的旋转光谱，以扩展这一系列工作，获得了四个新的纯旋转谱线的精确频率。使用可调谐远红外光谱仪测量的频率的高精度使我们能够将之前从红外光谱工作中获得的旋转常数提高两个数量级。报告该论文的草稿也在进行中。目前的结果正在准备中。2) H2D^+ 和 D_2H^+ 的旋转线频率的测量。H_2D^+ 和 D_2H^+ 是…更多的同位素种类。 H_3^+ 被认为是研究空间化学历史的关键物种我们十多年前测量了一些纯旋转线的频率我们现在重新测量了旋转线的频率。将测量范围扩展到我们光谱仪可观测区域的更多线。测量仍在进行中，准备提交。3）可调谐远红外光谱仪的改进，采用新型样品池。放电样品池。使用先前的研究人员已经证明扩展负辉光放电在分子阳离子的研究中是有效的，通过施加外部磁场，我们还改进了样品池以采用这种类型的放电。配备了新的电源和质量流量控制器，以保持放电足够稳定以进行精确测量。通过观察N_2H^+离子的旋转线来确认光谱仪的性能。该光谱仪将在未来的测量中发挥作用。分子阳离子。较少的