US 11,728,155 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)
Appl. No. 17/612,502
Filed by Thermo Fisher Scientific (Bremen) GmbH, Bremen (DE)
PCT Filed May 19, 2020, PCT No. PCT/EP2020/064005
§ 371(c)(1), (2) Date Nov. 18, 2021,
PCT Pub. No. WO2020/234319, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 1907171 (GB), filed on May 21, 2019.
Prior Publication US 2022/0216043 A1, Jul. 7, 2022
Int. Cl. H01J 49/06 (2006.01); H01J 49/02 (2006.01); H01J 49/00 (2006.01); H01J 49/10 (2006.01); H01J 49/42 (2006.01); F16K 1/20 (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)] 17 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, and
wherein the radio frequency electric focusing field has a varying frequency so as to reduce any mass dependence of ion trajectories through the ion optical arrangement.