Patent ID: 8729461
Filing Date: 2014-05-20
Classification: H01J

Abstract:
1. A mass spectrometer comprising: an ion mobility separator; a mass selective ion trap comprising a plurality of electrodes, wherein said mass selective ion trap is arranged downstream of said ion mobility separator; wherein in a mode of operation a group of ions is arranged to be within said ion mobility separator at an initial time T0; said mass spectrometer further comprising: a control system which is arranged and adapted: (i) to cause ions to emerge from said ion mobility separator during a first scan, wherein at least some of said ions which emerge from said ion mobility separator are subsequently received by and stored or trapped in or within said ion trap; and (ii) to cause said ion trap to mass selectively eject at least some ions out of said ion trap during a second scan; wherein said second scan is commenced after said first scan is completed.