Patent ID: 11862450
Assignee: THERMO FISHER SCIENTIFIC (BREMEN) GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 4:
5. 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; and
a set of vanes arranged in spacings between adjacent poles and serving as electrodes for providing a static electric 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,
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, and
wherein the voltage source is arranged for superimposing a frequency upon the static electric field produced by the vanes and/or the poles to change the number of oscillations of ions in the ion optical arrangement.