MULTIPOLE ASSEMBLY HAVING A MAIN MASS FILTER AND AN AUXILIARY MASS FILTER
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United States of America Patent
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Issued Date -
Jan 17, 2013
app pub date -
Feb 6, 2012
filing date -
Jul 15, 2011
priority date (Note) -
Abandoned
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Abstract
A multipole rod assembly for use in a mass spectrometer has a plurality of rods aligned around and parallel to a common ion optical axis. Each rod consists of two rod pieces that are collinear with one another. Each rod piece has an opposing face that is perpendicular to the axis and faces the other rod. One rod piece has a recess is its face. The rod pieces are physically connected together with an insulating piece located between the two rod pieces to electrically de-couple the rod pieces. The insulating piece has a shape and size that allows it to fit entirely within the recess so that, during operation of the mass spectrometer, the insulating piece is substantially screened from the ion optical axis.
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