Patent ID: 9117646
Filing Date: 2015-08-25
Classification: H01J

Abstract:
1. An apparatus comprising: a set of four substantially parallel rod electrodes having an ion occupation volume therebetween having an entrance end and an exit end, at least one of the rod electrodes having a slot passing therethrough; first and second ion optics disposed adjacent to the entrance and exit ends, respectively; a voltage supply system; and at least one supplemental electrode disposed at least partially within the at least one slot, wherein the voltage supply system is configured so as to supply a radio-frequency (RF) voltage, a direct-current (DC) filtering voltage and an oscillatory dipole resonant ejection voltage across members of the set of rod electrodes and so as to supply a secondary RF voltage and a secondary DC filtering voltage to the at least one supplemental electrode and to supply DC voltages across the rod electrodes and each of the first and second ion optics.