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OwnerFelician Muntean, Stephen Zanon +1inventors
InventorsFelician Muntean, Stephen Zanon, Desmond Allen Kaplan
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The invention relates to a radio frequency ion guide construction for use in mass spectrometry that minimizes contamination by allowing ions rejected by the RF confinement field to fly through and away from the ion guide electrodes and preventing them from hitting the sensitive electric potential defining surfaces of the ion guide electrodes. At the entrance end of the ion guide, each electrode of the plurality of electrodes has a front end that is forked or that contains a recessed feature facing an interior of the ion guide. For an electrode that is forked, the teeth of the forked end may have different shapes or tapers, and a conductive mesh may be used to cover a gap between the teeth. Similarly, for an electrode that has a recessed feature, a conductive mesh may cover the recessed feature.
A radio frequency ion guide having a plurality of electrodes arranged about an axis and a radio frequency voltage generator applying radio frequency voltages to the plurality of electrodes for radially confining ions, wherein the ions are received at an entrance end of the ion guide, and further wherein each electrode of the plurality of electrodes has a forked front end which is located at the entrance end of the ion guide.
A radio frequency ion guide having a plurality of electrodes arranged about an axis and a radio frequency voltage generator applying radio frequency voltages to the plurality of electrodes for radially confining ions, wherein the ions are received at an entrance end of the ion guide, and further wherein each electrode of the plurality of electrodes has a recessed feature at a surface facing an interior of the ion guide, the recessed feature being located at the entrance end of the ion guide, wherein the recessed feature is located at, and symmetrically around, a central portion of the electrodes.
A radio frequency ion guide having a plurality of electrodes arranged about an axis and a radio frequency voltage generator applying radio frequency voltages to the plurality of electrodes for radially confining ions, wherein the ions are received at an entrance end of the ion guide, and further wherein each electrode of the plurality of electrodes has a recessed feature at a surface facing an interior of the ion guide, the recessed feature being located at the entrance end of the ion guide, further comprising a conductive mesh which covers at least a portion of the recessed feature and thereby at least partially restores the electric potential defining surface facing the interior of the ion guide of each electrode.
Dependencies are inferred from the claim text.