A New Twin Ion Source Mass Spectrometer-Design Consideration-
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概要
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A new type twin ion source mass spectrometer is being developed with intending to make a simultaneous and continuous measurement of two samples of low mass.The most interesting application will be found in the simultaneous measurement of the respiratory gas and the blood gas. The principal construction of the instrument is a voltage scanning sector type mass spectrometer with two direct gas introduction system(the response of which is higher than50ms in the rise time of 95%)connected to the twin ion sources. The sources are made from one block and the arrangement of which is of side by side. for the easiness of construction. The magnetic field of 180 degree type is modified as to make the two source points and their image lines located just outside the magnet boundary with retaining the two image lines almost superposed and parallel to the boundary.The spacinng between the twin sources is determined as well as the positions of the two collectors so that the ions of the same mass from two sources are simultaneously accepted by the respective.collectors and the beams should not be interfered by other ions from the neighbouring sources at their collector position for all the ions of interest in the respiratory applications.Ions to be detected are selectively scanned by the step-wise potential with the frequency of about 100Hz . After amplified, the ion peaks are separated to the respective channels through analogue switches which are operated associating with the corresponding steps of the scanning potential.The mixing rate of the two samples between the twin sources should be determined so as to take a counterbalance with the clearance response of the ion source: the rate is obtainable as low as 1/200 without any compensation, with retainning the response of 50ms in the rise time of95%.In this paper, the discription of the instrument designed will be presented with some discussions on. several peculiar technical problems.
- 日本質量分析学会の論文
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