Correcting phases for ion polarity in ion trap mass spectrometry
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United States of America Patent
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Issued Date -
Jul 27, 2006
app pub date -
Aug 8, 2005
filing date -
Jan 25, 2005
priority date (Note) -
Abandoned
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Abstract
In a method and apparatus for adjusting a composite electric field to be applied to an ion trap to accommodate switching the operation of the ion trap between a positive ion mode and a negative ion mode, the composite electric field includes a plurality of component fields including at least one AC trapping field and one or more supplemental AC fields. A phase of one or more of the component fields is adjusted such that a force imparted by the composite field to a negative ion in the ion trap will be substantially the same as the force imparted by the composite field to a positive ion in the ion trap.
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