Patent ID: 8384027
Filing Date: 2013-02-26
Classification: G01N,H01J

Abstract:
1. An ion guide comprising: a first ion guide section comprising a first plurality of electrodes having at least one aperture through which ions are transmitted in use; a second ion guide section comprising a second plurality of electrodes having at least one aperture through which ions are transmitted in use; a first transfer section connecting said first ion guide section with said second ion guide section wherein ions are transmitted radially, in use, in said first transfer section from said first ion guide section into said second ion guide section, wherein said first and second ion guide sections comprise stacked ring ion guides and said first transfer section comprises one or more electrodes in said first ion guide section having a first radial aperture or cut-out and one or more electrodes in said second ion guide section having a second radial aperture or cut-out; and means for applying an AC or RF voltage to alternate ring electrodes of the stacked ring ion guides in order to confine ions radially within the first and second ion guide sections.