有機分析用大形高分解能質量分析計の試作と2,3の特性

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A large high resolution mass spectrometer has been constructed for the analysis of organic compounds. This apparatus is of a modified type of Nier-Johnson double focusing mass spectrometer. The dimensions for the ion trajectory were chosen as follows: central radius, deflecting angle and magnification of the electrostatic field are ae=500mm, φe=70°. and Me=0.555, and those in the magnetic field am=400mm, φ=70°, Mm=1.06, respectively. Therefore, the theoretical resolving power of this instrument is 71, 700 with the slit widths of the source and the collector are 0.005mm and 0.0028mm respectively. Step voltages of 9, 600, 7, 200, 4, 800, 3, 600 and 1, 800 V for ion acceleration were so established as to have respective mass ranges of M/e up to 450, 600, 900, 1200 and 1800. A new bright ion source having two dimensional parallel plate lens system was developed for this instrument. And, a secondary electron multiplier with a gain of 106 was used to measure the ion currents. A maximum resolution was obtained with a mixture sample of xenon and tetrachlo roethylene. The 131Xe-C235CI237CI doublet with the mass difference of 1.47 mu at M/e 131 was separately recorded with a 10% valley, so that the resolving power of this instrument estimated with this doublet is approximately, 89, 100 with definition of 10% valley separation using an collector slit about 0.001mm. In this case, the source slit width was estimated about 0.003mm, then theoretical resolving power corresponds to 148, 000. As the other experimental result, metastable transition processes of molecules have been studied using precursor spectral method. Preliminary investigations of n-butane and iso-butane revealed a number of transitions not previously reported, in addition to a high intensity for several known transitions.
日本質量分析学会の論文

有機分析用大形高分解能質量分析計の試作と2,3の特性

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