RF power supply for a mass spectrometer

摘要

The present invention provides a radio frequency (RF) power supply in a mass spectrometer. The power supply provides an RF signal to electrodes of a storage device to create a trapping field. The RF field is usually collapsed prior to ion ejection. In an illustrative embodiment the RF power supply includes a RF signal supply; a coil arranged to receive the signal provided by the RF signal supply and to provide an output RF signal for supply to electrodes of an ion storage device; and a shunt including a switch operative to switch between a first open position and a second closed position in which the shunt shorts the coil output.

主权项

1. A method of operating a mass spectrometer, comprising:
introducing a group of ions into an ion injector along a first axis, the ion injector including a plurality of electrodes; shutting off an RF potential applied to a first set of electrodes of the plurality of electrodes; applying a DC offset to a second set of electrodes of the plurality of electrodes to generate an electric field causing the group of ions to be ejected from the ion injector along a second axis substantially orthogonal to the first axis; and directing the group of ions ejected from the ion injector to a pulsed mass analyzer; wherein the DC offset has a rise time shorter than a period over which all ions of the group of ions are ejected from the ion injector.