Trial Experiment of Mass Analyzed Threshold Ionization Spectroscopy : Application for High Sensitive and Selective Detection of Transition Metal Compounds with Week Bonds

在本研究中，我的目的是开发一种“质量分析阈值电离光谱”的装置，可以应用于直接和选择性地检测具有相对较弱的化学键的化合物，以了解涉及过渡金属中心的反应机理。今年，在去年工作（主要是装置的设计和搭建）的基础上，对现有的“真空紫外单光子电离-飞行时间质谱”装置进行了改进。利用该装置，在芳香族化合物或过渡金属羰基化合物的电离阈值附近，测量了它们的飞行时间质谱谱和单光子电离形成的离子种类布居的电离波长依赖性。在我的实验系统中，我们获得了宽波长范围（120 - 180 nm）的可调谐真空紫外相干光（线宽为120 - 180 nm）。 ...更多信息 h ~（-0.4 cm^<-1>）。为了分离输入的一阶强光和产生的真空紫外光，真空紫外单色器之间的氪真空紫外发生器和电离区引入。通过这一改进，可以从实验数据中排除强一级输入激光对离子物种的多光子电离或二次光解的可能性。结果表明，在苯匀浆的情况下，在电离阈值附近的离子物种分布存在光解波长依赖性。此外，通过利用该科学研究资助金（C）购买的具有模拟操作处理的双通道矩形波串平均器（SRSSR 235/250 × 2/235/275）校正电离VUV光的强度波动，提高了离子信号的可靠性。通过这种改进，已经可以在电离阈值区域附近的离子物种分布的形成的作用谱（电离波长依赖性）中看到一些结构。这些结构的再现性进行了检查，并从理论上进行了讨论。此外，现有的装置主要适用于脉冲分子射流部分的“质量选择阈值光谱”。实验条件，这将是适合于这种光谱，已被检查与现有设备的进一步改进，虽然任何有意义的数据从来没有观察到在这种阈值光谱。少

In this research, I have aimed at developing an apparatus of"Mass Analyzed Threshold Ionization Spectroscopy" that can be applied for direct and selective detection of compounds with relatively week chemical bonds in order to understand reaction mechanism involving transition metal centers. This year, following the last year works (mainly design and construction of the apparatus), I have advanced the improvement of the existing apparatus of "VUV Single Photon Ionization-TOF mass spectroscopy". By using this device, some TOF-MASS spectra and the ionization wavelength dependence of ion species population formed through ionization by single-photon in the neighborhood of ionization threshold of aromatic compounds or transition metal carbonyls. I have groped for a possibility of "mass-selective threshold spectroscopy" all through remodeling the existing apparatus and these experimentsIn my experimental system, a wide wavelength range (120 - 180 nm) line tunable VUV coherent light (line widt … More h - 0.4 cm^<-1>) was generated by means of two-photon resonance four-wave difference frequency mixing with Kr gas as non-linear medium. In order to separate the intense input first-order lights and the generated VUV light, a VUV monochromator was introduced between the Kr vessel for VUV generation and the ionization region. By this improvement, the possibility of the multiphoton ionization or the secondary photolysis of ionic species by intense first order input laser light could be excluded from the experimental data. It was observed that there was the photolysis wavelength dependence of the ionic species distribution in the neighborhood of ionization threshold in the case of homogenate benzene. Furthermore, an ion signal reliability was improved through the correction of the intensity fluctuation of ionization VUV light by a two-channel boxcar averager (SRSSR235/250x2/235/275) with the analog operation treatment, which was purchased by this Grant-in-Aid for Scientific Research (C). By this improvement, it has been possible to see some structures in the action spectra (ionization wavelength dependence) of the formation of ionic species distribution in the neighborhood of ionization threshold region. The reproducibility of these structures have been examined and also discussed theoretically. Moreover, the existing apparatus was adapted for "mass-selective threshold spectroscopy" mainly in the pulse molecule jet part. The experimental conditions, which will be suitable to this spectroscopy, have been examined together with further improvements of the existing apparatus though any meaningful data have never been observed in this threshold spectroscopy. Less