Patent ID: 7411185
Filing Date: 2008-08-12
Classification: H01J

Abstract:
1. An atmospheric pressure ionization mass spectrometry system comprising: an atmospheric pressure ionization chamber for ionizing a sample, an intermediate evacuation chamber into which generated ions are introduced, a vacuum chamber disposed further downstream therefrom into which said ions are introduced for mass separation, a partition wall separating said atmospheric pressure ionization chamber from said intermediate evacuation chamber, said wall having an orifice therein, and a capillary tube installed on said partition wall so that an outlet end of said capillary tube abuts on said orifice, said capillary tube as a whole being directly attached to and detached from the partition wall, and having an internal diameter substantially corresponding to a diameter of the orifice to communicate with said orifice so that when the capillary tube is removed from the partition wall, the orifice communicates with the intermediate evacuation chamber without substantial change of a vacuum condition therein.