Patent ID: 11929246
Assignee: DH TECHNOLOGIES DEVELOPMENT PTE. LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method of performing mass analysis, comprising:
passing a plurality of ions through a quadrupole comprising a plurality of rods, said quadrupole rod set comprising an input end for receiving the ions and an output end through which ions exit the quadrupole,
applying at least one RF voltage to at least one of said rods so as to generate a field for radial confinement of the ions as they pass through the quadrupole,
applying an excitation voltage pulse across at least one pair of said plurality of rods so as to excite radial oscillations of at least a portion of the ions passing through the quadrupole at secular frequencies thereof such that an interaction between said excited ions with fringing fields in proximity of said output end facilitates exit of said excited ions through said output end and converts said radial oscillations into axial oscillations as said excited ions exit the quadrupole set,
wherein said RF voltage is phased locked relative to said voltage pulse.