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Pulsed discharge ionization source for miniature ion mobility spectrometers

United States Patent

November 23, 2004
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Pulsed Ionization Source for Ion Mobility Spectrometers
A method and apparatus is disclosed for flowing a sample gas and a reactant gas (38, 43) past a corona discharge electrode (26) situated at a first location in an ion drift chamber (24), applying a pulsed voltage waveform comprising a varying pulse component and a dc bias component to the corona discharge electrode (26) to cause a corona which in turn produces ions from the sample gas and the reactant gas, applying a dc bias to the ion drift chamber (24) to cause the ions to drift to a second location (25) in the ion drift chamber (24), detecting the ions at the second location (25) in the drift chamber (24), and timing the period for the ions to drift from the corona discharge electrode to the selected location in the drift chamber.
Xu; Jun (Knoxville, TN), Ramsey; J. Michael (Knoxville, TN), Whitten; William B. (Oak Ridge, TN)
UT-Battelle LLC (Oak Ridge, TN)
10/ 254,749
September 25, 2002
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made under Contract DE-AC05-000R22725 between the U.S. Department of Energy and the assignee of the present invention. The Government has certain rights in this invention.