Patent ID: 6191417
Filing Date: 2001-02-20
Classification: H01J

Abstract:
A method of operating a quadrupole spectrometer apparatus including a first quadrupole rod set and a second quadrupole rod set, the method comprising:(1) applying RF and DC voltages to the first and second quadrupole rod sets, to scan the first and second quadrupole rod sets in selected stability regions, and operating both the first and second quadrupole in a resolving mode for ions with the same mass to charge ratio;(2) generating a stream of ions and passing the stream of ions through the first quadrupole rod set and subsequently the second quadrupole rod set, and detecting ions exiting the second quadrupole rod set;(3) obtaining a peak shape from the ions exiting the second quadrupole rod set, the peak shape having at least one of higher resolution than the resolution of either one of the first and second quadrupole rod sets and less peak tailing than either one of the first and second rod sets.