Patent ID: 8148675
Filing Date: 2012-04-03
Classification: G01N,H01J

Abstract:
1. An MS/MS mass spectrometer in which a first mass separation unit for selecting an ion having a specific mass-to-charge ratio as a precursor ion from among a variety of ions, a collision cell for making the precursor ion collide with a predetermined gas in order to dissociate the precursor ion by a collision-induced dissociation (CID), and a second mass separation unit for selecting an ion having a specific mass-to-charge ratio from among a variety of product ions generated by a dissociation of the precursor ion, are linearly disposed, wherein a length of the collision cell in a direction along an ion optical axis is determined to be in a range between 40 and 80 mm; wherein a flow of predetermined gas inside the collision cell is formed in a counter direction of a traveling direction of an ion; and the collision cell includes a supply pipe for supplying the CID gas including a gas ejection port that is curved in the anterior direction.