Patent ID: 8829463
Filing Date: 2014-09-09
Classification: H01J

Abstract:
1. An ion transport apparatus for a mass spectrometer or an ion mobility spectrometer comprising: (a) a plurality of strip electrodes disposed in a series on a flat substrate; (b) an ion outlet aperture in the substrate disposed adjacent to a first one of the plurality of strip electrodes; (c) a cage electrode at least pa ally enclosing the plurality of strip electrodes and the ion outlet aperture; (d) an extraction electrode disposed adjacent to the ion outlet aperture; (e) a radio frequency (RF) voltage generator operable to supply an oscillatory RF voltage to each of the plurality of strip electrodes such that an RF phase difference exists between each pair of adjacent electrodes; and (f) at least one DC voltage source operable to supply a first DC voltage to the cage electrode, a second DC voltage to the extraction electrode and a respective DC bias voltage to each of the plurality of electrodes, wherein each strip electrode comprises a respective width such that the electrode strip widths of a series of the plurality of electrodes progressively increase away from the first one of the plurality of electrodes.