Patent ID: 8129674
Filing Date: 2012-03-06
Classification: H01J

Abstract:
1. A tandem mass spectrometer comprising: an ion source for ionizing a sample; an ion trap section for carrying out collision induced dissociation of the target ions for producing fragment ions and for discharging unnecessary ions other than target ions; a multi electrode collision section for, carrying out collision induced dissociation of the fragment ions introduced therein; a mass spectrometric analysis section for conducting mass spectrometric analysis of the converged fragment ions; and a controller programmed to perform: selecting, after the target ions selected by the ion trap section are subjected to collision induced dissociation, specific fragment ions among the fragment ions and transferring the specific fragment ions to the multi electrode collision section to carry out collision induced dissociation therein, automatically selecting either the collision induced dissociation in the trap section or the collision induced dissociation in the multi-electrode collision section in accordance with a signal from a data processing section, and if the controller judges that a mass number of the second fragment ions is larger than a cut-off zone of the ion trap section, conducting a second collision induced dissociation is by the ion trap section and conducting mass spectrometry of the produced fragment ions.