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Title: Asymmetric ion trap

An ion trap having two end cap electrodes disposed asymmetrically about a center of a ring electrode. The inner surface of the end cap electrodes are conformed to an asymmetric pair of equipotential lines of the harmonic formed by the application of voltages to the electrodes. The asymmetry of the end cap electrodes allows ejection of charged species through the closer of the two electrodes which in turn allows for simultaneously detecting anions and cations expelled from the ion trap through the use of two detectors charged with opposite polarity.
 [1];  [1];  [2]
  1. (Richland, WA)
  2. (Pasco, WA)
Issue Date:
OSTI Identifier:
Battelle Memorial Institute (Richland, WA) PNNL
Patent Number(s):
US 5693941
Contract Number:
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA
Country of Publication:
United States
asymmetric; trap; cap; electrodes; disposed; asymmetrically; center; electrode; inner; surface; conformed; pair; equipotential; lines; harmonic; formed; application; voltages; asymmetry; allows; ejection; charged; species; closer; simultaneously; detecting; anions; cations; expelled; detectors; opposite; polarity; charged species; opposite polarity; inner surface; cap electrodes; simultaneously detecting; electrodes disposed; equipotential lines; /250/