METHOD OF INJECTION OF EXTERNALLY PRODUCED IONS INTO A QUADRUPOLE ION TRAP

摘要

A method of ion introduction and trapping comprising the steps of: (a) providing a radio frequency (RF) ion trap with a buffer gas; (b) producing a continuous ion beam from an external ion source; (c) directing said beam to said RF ion trap through a gating device for a predetermined period of accumulation time to allow said ion beam to enter said ion trap; (d) applying an RF voltage to said ion trap to create a main RF trap field therein for trapping ions over a range of masses; and (e) changing an amplitude of said RF voltage adiabatically for achieving a uniform trapping efficiency for ions of said ion beam over a predetermined mass range.