Linear RF ion trap with high mass resolution

Details Linear RF ion trap with high mass resolution Linear RF ion trap with high mass resolution

2007-12-13

2010-06-15

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S281000

Reexamination Certificate

active

07737398

ABSTRACT:
In a linear ion trap in which an essentially quadrupole RF electrical field is generated between at least four rod-shaped electrodes, ions may be mass-selectively ejected orthogonally to the axis. An aspect of the invention comprises compensating for field irregularities along the axis of a linear ion trap, which result, at different ejection locations, in the ejection of ions of the same masses at slightly different times, by of measuring the ions that are ejected at the different ejection locations using a number of separate detectors, and correcting, after a mass calibration of each of the mass spectra, the time shifts of the various location-dependent mass spectra during their addition to a combined spectrum.

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