Patent ID: 9111654
Filing Date: 2015-08-18
Classification: G21K,H01J

Abstract:
1. An ion guide comprising: a plurality of electrodes comprising a planar array of electrodes; a first device arranged and adapted to apply a RF voltage to at least some of said electrodes in order to form, in use, a pseudo-potential well which acts to confine ions in a first (y) direction within said ion guide; a second device arranged and adapted to apply a DC voltage to at least some of said electrodes in order to form, in use, a DC potential well which acts to confine ions in a second (z) direction within said ion guide; and a third device arranged and adapted to cause ions having desired or undesired mass to charge ratios to be mass to charge ratio selectively ejected from said ion guide in said second (z) direction; wherein ions are arranged to enter said ion guide along a third (x) direction; and wherein said DC potential well comprises a quadratic potential well.