US 11,887,832 B2
Mass spectrometer
Johannes Schwieters, Ganderkesse (DE); and Gerhard Jung, Delmenhorst (DE)
Assigned to Thermo Fisher Scientific (Bremen) GmbH, Bremen (DE)
Filed by Thermo Fisher Scientific (Bremen) GmbH, Bremen (DE)
Filed on Mar. 24, 2022, as Appl. No. 17/703,899.
Application 17/703,899 is a continuation of application No. 16/981,891, abandoned, previously published as PCT/EP2019/056884, filed on Mar. 19, 2019.
Prior Publication US 2022/0223401 A1, Jul. 14, 2022
Int. Cl. H01J 49/28 (2006.01); H01J 49/06 (2006.01); H01J 49/10 (2006.01)
CPC H01J 49/288 (2013.01) [H01J 49/067 (2013.01); H01J 49/105 (2013.01)] 36 Claims
OG exemplary drawing
 
1. A mass spectrometer comprising:
a static field mass filter having:
an entrance aperture configured to receive an ion beam from an ion source,
an exit aperture configured to eject ions, the static field mass filter defining a longitudinal symmetry axis between the entrance and exit apertures,
a first Wien filter configured to deflect ions away from the longitudinal symmetry axis in accordance with their m/z,
a second Wien filter configured to deflect the ions back towards the longitudinal symmetry axis in accordance with their m/z, and
an inverting lens positioned along the longitudinal symmetry axis between the first and second Wien filters, to invert the direction of deflection of the ions from the first Wien filter;
an ion source arranged upstream of the static field mass filter and configured to direct ions into the entrance aperture thereof; and
a mass analyser arranged downstream of the static field mass filter, configured to mass analyse either (a) ions ejected from the exit aperture thereof, or (b) product ions derived from the ions ejected from the exit aperture of the static field mass filter.