Efficient Atmospheric Pressure Interface for Mass Spectrometers and Method
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United States of America Patent
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Issued Date -
Nov 19, 2009
app pub date -
Aug 2, 2007
filing date -
Nov 7, 2006
priority date (Note) -
Abandoned
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Abstract
An interface for atmospheric pressure ionization sources has an ion transfer tube with a plurality of passageways through a sidewall such that background gas can be pumped away before it reaches an exit end of the ion transfer tube. A flow of the background gas out the exit end is reduced, and a proportion of laminar flow in the ion transfer tube may be increased. Pressure in the ion transfer tube is also reduced and desolvation is increased. In one embodiment, an enclosure surrounds an inner tube of the ion transfer tube within a first vacuum chamber such that the enclosure provides a reduced pressure region within the first vacuum chamber. Overall, transport efficiency is increased.
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