Electric field control in ion mobility spectrometry
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United States of America Patent
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Aug 8, 1989
Grant Date -
N/A
app pub date -
Jul 3, 1986
filing date -
Jul 3, 1986
priority date (Note) -
Expired
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Abstract
An ion mobility spectrometer for detecting ions and for facilitating controlled chemical reactions is described incorporating an inlet for carrier and sample gas, a reaction region having an ionization source and at least two electrodes for generating an electric field and a drift region having at least two electrodes for generating an electric field therein wherein each electrode is coupled to a power supply for placing a predetermined potential on the electrode and wherein each power supply is controlled by an electric field controller for providing a sequence of potentials on each electrode in the reaction region and drift region to control the motion and position of ions in the drift region. The invention overcomes the problem of detection sensitivity, detection selectivity and resolution between ions of similar mobility. The invention further overcomes the problem of facilitating certain chemical reactions by brings ions of opposite polarity together.
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