Method and apparatus for directing ions and other charged particles generated at near atmospheric pressures into a region under vacuum
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United States of America Patent
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Aug 22, 2000
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N/A
app pub date -
Jun 3, 1998
filing date -
Jun 3, 1998
priority date (Note) -
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Abstract
A method and apparatus for focusing dispersed charged particles. More specifically, a series of elements within a region maintained at a pressure between 10.sup.-1 millibar and 1 bar, each having successively larger apertures forming an ion funnel, wherein RF voltages are applied to the elements so that the RF voltage on any element has phase, amplitude and frequency necessary to define a confinement zone for charged particles of appropriate charge and mass in the interior of the ion funnel, wherein the confinement zone has an acceptance region and an emmitance region and where the acceptance region area is larger than the emmitance region area.
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