TANDEM TIME-OF-FLIGHT MASS SPECTROMETER

PROBLEM TO BE SOLVED: To eliminate waste of time and samples which is caused when a single MS mode and a tandem MS/MS mode are switched, with a simple structure. SOLUTION: An ion detector which is arranged in an ion flying trajectory or in the vicinity of the ion flying trajectory, and a deflector which deflects ions toward the ion detector in the vicinity of the ion flying trajectory are installed in a first mass spectrometer. A first mode in which the ions that fly in the first mass spectrometer are successively detected by the detector in the ion flying trajectory or in which the ions are deflected toward the detector in the vicinity of the ion flying trajectory by the deflector, and a second mode in which only desired ions that are separated in the first mass spectrometer are mass-analyzed in the second mass spectrometer positioned at the latter stage of the first mass spectrometer, and other ions are deflected by the deflector and successively detected by the ion detector positioned at deflected place are equipped switchably. COPYRIGHT: (C)2009,JPO&INPIT