Patent ID: 9177771
Filing Date: 2015-11-03
Classification: H01J

Abstract:
1. A mass spectrometer system, comprising: an ion source for generating ions from a sample; a vacuum chamber comprising an inlet aperture for receiving the ions, and an exit aperture for passing ions from the vacuum chamber; at least one ion guide between the inlet and exit apertures, the at least one ion guide having an entrance end and an exit end; the at least one ion guide comprising an inner cylinder and an outer cylinder, the inner cylinder having a plurality of sections, each section comprising a plurality of slots in the inner cylinder and each of the plurality of sections of the inner cylinder comprises a different number of slots, the inner cylinder coaxially disposed within the outer cylinder, wherein the inner cylinder is configured to generate more than one multipole RF field; and a power supply for providing an RF voltage between the outer and inner cylinders for radially confining the ions within the inner cylinder of the at least one ion guide.