Multipole ion guide having longitudinally rounded electrodes

Details Multipole ion guide having longitudinally rounded electrodes Multipole ion guide having longitudinally rounded electrodes

2006-06-16

2009-02-17

Berman, Jack I (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S288000, C250S284000

Reexamination Certificate

active

07491932

ABSTRACT:
An ion guide having a plurality of spheroidal or similarly shaped electrodes is disclosed. The electrodes are arranged in pairs about a central ion flow axis, and an RF voltage is applied in a prescribed phase relation to create an electric field that focuses and radially confines an ion beam. A defocusing effect associated with the electrode shape may be reduced by placement of a separate skirt electrode immediately downstream in the ion path, or by forming the electrodes in a composite structure, whereby the trailing portion of the electrode is fabricated from or coated with an insulative material.

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patent: 6730904 (2004-05-01), Wells
patent: 6926783 (2005-08-01), Loucks, Jr.
patent: 2003/0136905 (2003-07-01), Franzen et al.
patent: 2004/0262511 (2004-12-01), Kato
patent: 2005/0067564 (2005-03-01), Douglas et al.
patent: 2005/0258364 (2005-11-01), Whitehouse et al.
patent: 2006/0118716 (2006-06-01), Michaud et al.
patent: 2008/0067365 (2008-03-01), Thakur et al.

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