Ion guides with movable RF multiple segments
View Patent ↗The invention relates to an ion guide consisting of RF multipole segments to transfer ions from an ion source into a mass analyzer. The invention consists in having movable RF multipole segments in the ion guide which extend or electrically connect other RF multipole segments along the axis of the ion guide, in which spaces have arisen as a result of a change in configuration of the mass spectrometer, comprising ion source, ion guide and mass analyzer. The moved RF multipole segments bridge the spaces which have arisen between the components of the mass spectrometer and facilitate the transfer of the ions from the ion source to the mass analyzer.
1. Ion guide for transferring ions, comprising RF multipole segments, wherein
a) at least one RF multipole segment is movable with respect to other RF multipole segments of the ion guide, and
b) the movable RF multipole segments can be spatially moved so as to have electrical contact with other RF multipole segments and either extend these other RF multipole segments or electrically interconnect these other RF multipole segments.
2. Ion guide according to claim 1 , wherein the RF multipole segments of the ion guide consist of rod-shaped or tubular electrodes, and neighboring rod-shaped or tubular electrodes are supplied with an antiphase RF voltage.
3. Ion guide according to claim 2 , wherein the rod-shaped or tubular electrodes of the movable RF multipole segments can be slid into or over the rod-shaped or tubular electrodes of other RF multipole segments.
4. Ion guide according to claim 2 , wherein the rod-shaped or tubular electrodes of the movable RF multipole segments can be moved between the rod-shaped or tubular electrodes of other RF multipole segments.