US 11,862,450 B2
Switchable ion guide
Henning Wehrs, Bremen (DE); Johannes Schwieters, Ganderkesee (DE); and Gerhard Jung, Delmenhorst (DE)
Assigned to Thermo Fisher Scientific (Bremen) GmbH, Bremen (DE)
Appl. No. 17/612,092
Filed by Thermo Fisher Scientific (Bremen) GmbH, Bremen (DE)
PCT Filed May 19, 2020, PCT No. PCT/EP2020/064004
§ 371(c)(1), (2) Date Nov. 17, 2021,
PCT Pub. No. WO2020/234318, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 1907171 (GB), filed on May 21, 2019.
Prior Publication US 2022/0216044 A1, Jul. 7, 2022
Int. Cl. H01J 49/10 (2006.01); H01J 49/42 (2006.01); H01J 49/06 (2006.01); H01J 49/00 (2006.01); H01J 49/02 (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)] 22 Claims
OG exemplary drawing
 
1. An ion optical arrangement for use in a mass spectrometer comprising:
a collision cell defining an ion optical axis along which ions may pass;
electrodes comprising a set of parallel poles arranged in the collision cell;
a voltage source for providing voltages to the electrodes to produce electric fields;
an einzel lens for producing the static electric focusing field;
wherein the ion optical arrangement is arranged for switching between a first operation mode in which the collision cell is pressurized and a second operation mode in which the collision cell is substantially evacuated, and
wherein the ion optical arrangement is further arranged for producing a radio frequency electric focusing field in the first operation mode and a static electric focusing field in the second operation mode
wherein at least two of the poles are each partitioned in at least three electrically isolated sections consecutively arranged along a longitudinal axis of the pole, and
wherein the voltage source is arranged for supplying different direct current voltages to adjacent sections of a pole in the second operation mode.