高速走査形質量分析計

概要

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The ion detector for a fast scanning mass spectrometer has been developed. The instrument used is a Hitachi mass spectrometer: modified RMU-6D, of a single focusing, 90° sector type. A mass range of m/e 10-500 may be magnetically scanned in 3 seconds: the peaks are recorded on strip chart of are cording galvanometer. The ion detector is described which incorporates a electron-multiplier and a fast response electrometer. The electron multiplier consists of 10 stage Ag-Mg dynodes. The electrometer has the feedback resistor sorunded a metal sleeve which is connected the output of the amplifier through a P.I.D. network and the response speed is increased. The response and the noise of the ion detector are discussed. Design procedures led from the discussion and the complete circuits are given. The ion detector can be used in measurement of current from 2.5×10-11 to 1×10-14 amperes and the 90% inditial response is 40 microseconds.
日本質量分析学会の論文