Ion funnel with improved ion screening
AssigneeBruker Daltonik GmbH
InventorJochen Franzen
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Abstract
An ion funnel screen ions from a gas stream flowing into a differential pump stage of a mass spectrometer, transfers them to a subsequent differential pump stage. The ion funnel uses apertured diaphragms between which gas escapes easily. Holders for the apertured diaphragms are also provided that offer little resistance to the escaping gas while, at the same time, serving to feed the RF and DC voltages.
Claims7
An ion funnel, comprising a stack of parallel, coaxially arranged ring-shaped apertured diaphragms with tapering internal diameter, contacted by RF and DC voltages, wherein the smallest internal diameter of the apertured diaphragms is greater than three times the spatial repetition distance of the apertured diaphragms at the output of the ion funnel.
Dependencies are inferred from the claim text.