Patent ID: 7026610

Claim:
A mass spectrometer system for mass analysis of a sample to be measured, by ionizing the sample, comprising: a first ion source for ionizing the sample; a second ion source for producing ions of a polarity reversed from that of the ions produced in said first ion source; an ion deflector for introducing and deflecting the ions of said first and second ion sources; an ion-trap mass spectrometer including a ring electrode and a pair of endcap electrodes; a detector for detecting ions ejected from said ion-trap mass spectrometer; a first gate electrode arranged between said first ion source and said ion deflector; and a second gate electrode arranged between said second ion source and said ion deflector, wherein voltage applied to the first and second gate electrodes is controlled to adjust an amount of ions led from said first and second ion sources to said ion-trap mass spectrometer through said ion deflector, the ions from said first and second ion sources being mixed in said ion-trap mass spectrometer and detected in said detector.