有機分析用高分解能質量分析計

概要

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A double focusing mass spectrometer was constructed for the organic structural analysis. The electrostatic sector was designed as an attachment of the Hitachi RMU-6D mass spectrometer system. The dimensions for the ion trajectory were chosen as follows: central radius and deflection angle of the magnetic field are am=20cm and φm=90° (symmetric), and those in the electrostatic field ae=25 cm and φe=45°(le′=41 cm and le″=20.6cm), respectively. Step voltages of 3600, 1800, 900 and 600V for ion accelaration were so established as to have respective mass ranges of M/e 1-300, 2-1200 and 6-1800. Four identical slit mechanisms were employed as the source(main slit), alpha, beta and collector slit apertures adjustable up to 1mm with a precision of several microns. A secondary electron multiplier with a gain of 104 was used to measure the ion currents. In order to minimize the catalytic decomposition of the sample materials, the main part of the sample inlet system was made of all glass and enclosed in a thermostatic oven heated up to 350°C. The C5H5N-13CC5H6 doublet with the mass difference of 8 mu at M/e 79 was separately recorded with a 15% valley when both peak heights were nearly equal, so that the resolving power of the instrument approachs to the theoretical value of M/ΔM 12, 500 when using 10 μ collectorslit.
日本質量分析学会の論文