Patent ID: 8987664
Filing Date: 2015-03-24
Classification: H01J

Abstract:
1. A mass spectrometry apparatus with a multistage differential evacuation system, comprising: an ambient pressure ion source which ionizes a sample in an ambient pressure atmosphere; a mass analysis unit which separates and detects ions according to mass-charge ratio; at least one ion transport optical system which transports ions from said ambient pressure ion source to said mass analysis unit; an ionization chamber which has a near-ambient pressure atmosphere and encloses said ambient pressure ion source; an analysis chamber which has a high vacuum atmosphere and encloses said mass analysis unit; one or multiple intermediate vacuum chambers which are disposed between said ionization chamber and said analytical chamber and enclose said ion transport optical system; an ion inlet unit for transporting ions from said ionization chamber to the next stage intermediate vacuum chamber; a pressure sensor which detects gas pressure inside said next stage intermediate vacuum chamber; and a control unit configured