Orthogonal Acceleration Coaxial Cylinder Mass Analyser

摘要

A mass analyser is disclosed comprising an annular ion guide comprising a first annular ion guide section and a second annular ion guide section, wherein the annular ion guide comprises: (i) an inner cylindrical electrode arrangement which is axially segmented and comprises a plurality of first electrodes and (ii) an outer cylindrical electrode arrangement which is axially segmented and comprises a plurality of second electrodes. Ions are introduced into the first annular ion guide section so that the ions form substantially stable circular orbits. Ions are orthogonally accelerated from the first annular ion guide section into the second annular ion guide section and one or more parabolic DC potentials are maintained along a portion of the second annular ion guide section so that ions undergo simple harmonic motion. An inductive ion detector is arranged and adapted to detect ions within the second annular ion guide section.

主权项

1. A mass analyser comprising:
an annular ion guide having a longitudinal axis and comprising a first annular ion guide section and a second annular ion guide section, wherein said annular ion guide comprises: (i) an inner cylindrical electrode arrangement which is axially segmented and comprises a plurality of first electrodes; and (ii) an outer cylindrical electrode arrangement which is axially segmented and comprises a plurality of second electrodes; a first device arranged and adapted to introduce ions into said first annular ion guide section so that said ions form substantially stable circular orbits within said first annular ion guide section about said longitudinal axis; a second device arranged and adapted to orthogonally accelerate ions from said first annular ion guide section into said second annular ion guide section; a device arranged and adapted to maintain one or more parabolic DC potentials along a portion of said second annular ion guide section so that ions undergo simple harmonic motion; and an inductive ion detector arranged and adapted to detect ions within said second annular ion guide section.