US 12,087,567 B2
Ion guide with reduced noding effect
Henning Wehrs, Bremen (DE); Johannes Schwieters, Ganderkesee (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 Jun. 22, 2023, as Appl. No. 18/339,510.
Application 18/339,510 is a continuation of application No. 17/612,502, granted, now 11,728,155, previously published as PCT/EP2020/064005, filed on May 19, 2020.
Claims priority of application No. 1907171 (GB), filed on May 21, 2019.
Prior Publication US 2023/0343571 A1, Oct. 26, 2023
Int. Cl. H01J 49/06 (2006.01); F16K 1/20 (2006.01); H01J 49/00 (2006.01); H01J 49/02 (2006.01); H01J 49/10 (2006.01); H01J 49/42 (2006.01)
CPC H01J 49/063 (2013.01) [F16K 1/2007 (2013.01); H01J 49/005 (2013.01); H01J 49/0077 (2013.01); H01J 49/022 (2013.01); H01J 49/065 (2013.01); H01J 49/067 (2013.01); H01J 49/068 (2013.01); H01J 49/105 (2013.01); H01J 49/421 (2013.01); H01J 49/4215 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An ion optical arrangement for use in a mass spectrometer comprising:
electrodes comprising a multipole arrangement defining an ion optical axis, and
a voltage source for providing voltages to the electrodes to produce electric fields,
wherein the ion optical arrangement is configured for producing a radio frequency electric focusing field for focusing ions on the ion optical axis,
wherein the ion optical arrangement is further configured for producing a static electric field, and
wherein a varying electric field is superimposed upon the static electric field so as to reduce any mass dependence of ion trajectories through the ion optical arrangement,
wherein the static electric field comprises an axial DC field produced by a DC auxiliary voltage applied to auxiliary electrodes arranged in parallel with the multipole, and wherein the superimposed varying electric field is produced by superimposing an AC voltage upon the DC auxiliary voltage.