Patent ID: 9269558
Filing Date: 2016-02-23
CPC Classification: H01J

Claim Text:
1. An MS/MS type mass spectrometer, comprising: a first mass separator, selecting, from various kinds of ions, a product ion having a specific mass-to-charge ratio as a precursor ion; an ion fragmentation unit, subjecting the precursor ion to fragmentation; a second mass separator, selecting a product ion having a specific mass-to-charge ratio from various kinds of product ions generated by the fragmentation; a detector, detecting the product ion selected by the second mass separator; and a control unit, controlling the first mass separator, the ion fragmentation unit, the second mass separator and the detector to execute an analysis, and analyzing data resulting from the executed analysis, wherein the control unit further comprises: a detecting unit, detecting a mass peak with the highest appearance frequency from all mass spectra generated by all the executed product ion scan events, wherein the mass peak with the highest appearance frequency is selected determined to be an optimum product ion peak of the precursor ion by the control unit.