Quadrupole ion trap device and methods of operating a...

Details Quadrupole ion trap device and methods of operating a... Quadrupole ion trap device and methods of operating a...

2007-10-23

2007-10-23

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S292000, C250S290000

Reexamination Certificate

active

10494493

ABSTRACT:
A quadrupole ion trap device has a field adjusting electrode located outside the trapping region adjacent the aperture in the entrance end cap electrode, and optionally adjacent the aperture in the exit end cap electrode. The field adjusting electrode(s) controls field distortion in the vicinity of the apertures. By appropriately setting the voltages on the field adjusting electrodes the efficiency and resolution of operational processes such as ion introduction, precursor ion isolation and mass scanning can be improved.

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J. Mitchell Wells, Wolfgang R. Plass, R. Graham Cooks, Control of Chemical Mass Shifts in the Quadrupole Ion Trap Through Selection of Resonance Ejection Working Point and rf Scan Direction, Analytical Chemistry, vol. 72, No. 13, Jul. 1, 2000, pp. 2677-2683.

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