Patent ID: 8653447

Claim:
A chromatograph mass spectrometer having a chromatograph in which components of a sample are separated in a temporal direction and a mass spectrometer with a quadrupole mass filter in which ions originating from the components of the sample separated by the chromatograph are separated according to mass-to-charge ratios thereof, the chromatograph mass spectrometer comprising: a) a quadrupole driver for applying a direct-current voltage and a radio-frequency voltage to each electrode constituting the quadrupole mass filter, so as to selectively allow an ion having a specific mass-to-charge ratio to pass through; b) a controller for controlling the quadrupole driver so as to change the applied voltages in such a manner that a mass-resolving power is sequentially switched among a plurality of previously determined levels of mass-resolving power when a target ion originating from a target component is allowed to pass through the quadrupole mass filter and be detected; and c) a chromatogram creator for creating an extracted ion chromatogram based on each of a plurality of data obtained under conditions with different levels of mass-resolving power set for the target ion.