Abstract
Single and recurrent multi-channel scaling of ion current was used for the mass spectrometry of very small samples. Isotopic analysis of rare gases was carried out with single multi-channel ion scaling using a low background mass spectrometer. Corrections for background, memory effect and time variations of various factors which cause systematic errors are more easily made with this method than even with direct ion current measurement method although those corrections are impossible or very difficult with simple ion counting method. Recurrent multi-channel scaling made it possible to measure very low pressure for long time operation(more than 100 hours)discriminating the peaks of accidental noise pulses. Mass discrimination caused by ion counting and dead time correction at high counting rate are discussed.
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