Patent ID: 6180941
Filing Date: 2001-01-30
Classification: H01J

Abstract:
A mass spectrometer, comprising:an ion source unit for ionizing sample compounds to be analyzed, said ion source unit being disposed in a substantially atmospheric pressure region;an ion trap type mass analyzer unit for mass analyzing the ions from said ion source unit, said ion trap type mass analyzer unit being disposed in a vacuum region;a differential pumping region disposed between said substantially atmospheric pressure region and said vacuum region;a first electrode having an aperture for introducing the ions from said ion source unit into said differential pumping region, said first electrode being disposed between said substantially atmospheric pressure region and said differential pumping region;a second electrode having an aperture for introducing the ions from said differential pumping region into said ion trap type mass analyzer unit, said second electrode being disposed between said differential pumping region and said vacuum region; andan energy control unit for controlling the energy of the ions introduced in said ion trap type mass analyzer unit,wherein said energy control unit includes an electric power supply which applies a voltage on said second electrode for controlling the energy of the ions introduced in said ion trap type mass analyzer unit.