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Method and apparatus for directing ions and other charged particles generated at near atmospheric pressures into a region under vacuum

United States Patent

6,107,628
August 22, 2000
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
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.
Smith; Richard D. (Richland, WA), Shaffer; Scott A. (Seattle, WA)
Battelle Memorial Institute (Richland, WA)
09/ 090,896
June 3, 1998
This invention was made with Government support under Contract DE-AC06-76RLO 1830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.