Mass spectrometry device and method using ion-molecule reaction ionization

A mass spectrometer that uses ion-molecule reaction ionization, comprising:

• a sample loading unit in which to load a sample containing a plurality of components, the sample loading unit adapted to gasify the loaded sample;
• an ionizer to which the gasified sample is introduced from the sample loading unit, the ionizer adapted to continuously perform the ion-molecule reaction on the introduced sample a plurality of times;
• a single mass spectrometer for analyzing ions introduced from the ionizer;
• and
• a controller/analyzer that controls the operation of the ionizer and subjects the sample to qualitative/quantitative analysis on the basis of the ion analysis by the mass spectrometer,
• wherein the ionizer comprises a plurality of ion sources arranged in series with an outlet leading to the single mass spectrometer,
• wherein each of the ion sources comprises a respective ion chamber and a respective discharge needle,
• wherein each of adjacent ion chambers are connected by a respective connection part having a cross-sectional area that is smaller than a cross-sectional area of the adjacent ion chambers in a same plane,
• wherein residual neutral molecules that are not ionized are transferred from the first one of the ion sources to a second one of the ion sources through a respective connection part, and
• wherein the controller/analyzer performs control on a judgment as to which one or more of the ion sources is to be driven.