Separation and axial ejection of ions based on m/z ratio

Details Separation and axial ejection of ions based on m/z ratio Separation and axial ejection of ions based on m/z ratio

2007-04-24

2009-12-15

Berman, Jack I (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S283000, C250S290000

Reexamination Certificate

active

07633060

ABSTRACT:
A mass spectrometer includes a multipole having a main RF field for radially containing ions generally on a central axis. The multipole has first and second axial DC fields in opposite first and second direction along a length of the multipole. The first and second axial DC fields approach or add substantially to zero on the central axis. The multipole has an excitation voltage applied thereto for selectively exciting the ions of desired m/z ratios off the central axis. The excitation voltage thus causes excursion of the ions into a region where either the first or second axial DC field is strong. Thus, excitation of the ions and the DC fields cause ion drift toward a front end or a back end of the multipole. Further excitation moves the ions into regions of the DC fields that overcome barriers and causes axial ejection of the ions from the multipole.

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Hashimoto et al., “Mass Selective Ejection by Axial Resonant Excitation from a Linear Ion Trap,” J Am Soc Mass Spectrom, Elsevier Inc., p. 685-690, (2006).

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