Ion transfer tube with spatially alternating DC fields

Details Ion transfer tube with spatially alternating DC fields Ion transfer tube with spatially alternating DC fields

2011-07-19

2011-07-19

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S289000, C250S293000, C250S397000, C250S288000, C250S3960ML, C313S360100, C313S007000

Reexamination Certificate

active

07982183

ABSTRACT:
An ion transfer arrangement for transporting ions between higher and lower pressure regions of a mass spectrometer includes an electrode assembly (120) with a first plurality of ring electrodes (205) arranged in alternating relation with a second plurality of ring electrodes (210). The first plurality of ring electrodes (205) are narrower than the second plurality of ring electrodes (210) in a longitudinal direction, but the first plurality of ring electrodes have a relatively high magnitude voltage of a first polarity applied to them whereas the second plurality of ring electrodes (210) have a relatively lower magnitude voltage applied to them, of opposing polarity to that applied to the first set of ring electrodes (205). In this manner, ions passing through the ion transfer arrangement experience spatially alternating asymmetric electric fields that tend to focus ions away from the inner surface of the channel wall and towards the channel plane or axis of symmetry.

REFERENCES:
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patent: 6483109 (2002-11-01), Reinhold et al.
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patent: 2004/0108450 (2004-06-01), Makarov et al.
patent: 2010/0038532 (2010-02-01), Makarov et al.
patent: 2010/0038533 (2010-02-01), Makarov et al.
Shenheng et al., “Stacked-Ring Electrostatic Ion Guide,” Journal of the American Society for Mass Spectrometry, Elsevier Science Inc. (US), vol. 7 (No. 1), pp. 101-106, (1996).

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