Multipole ion guide having longitudinally rounded electrodes
First Claim
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1. An ion guide comprising:
- a plurality of electrodes arranged around a central ion flow axis, each of the plurality of electrodes having a continuously rounded inner surface in a longitudinal plane extending through the ion flow axis; and
a radio-frequency (RF) voltage source for applying an RF voltage to the plurality of electrodes.
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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.
17 Citations
19 Claims
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1. An ion guide comprising:
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a plurality of electrodes arranged around a central ion flow axis, each of the plurality of electrodes having a continuously rounded inner surface in a longitudinal plane extending through the ion flow axis; and a radio-frequency (RF) voltage source for applying an RF voltage to the plurality of electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An inlet section for a mass spectrometer, comprising:
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an ion source configured to produce ions within an ion chamber, the ions having an ion path; and an ion guide positioned downstream of the ion source in the ion path, the ion guide including a plurality of electrodes arranged around a central ion flow axis, each of the plurality of electrodes having a continuously rounded inner surface in a longitudinal plane extending through the ion flow axis; and
a radio-frequency (RF) voltage source for applying an RF voltage to the plurality of electrodes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification