APPARATUS FOR SIMULTANEOUS DETECTION OF POSITIVE AND NEGATIVE IONS IN ION MOBILITY SPECTROMETRY

摘要

APPARATUS FOR SIMULTANEOUS DETECTION OF POSITIVEAND NEGATIVE IONS IN ION MOBILITY SPECTROMETRYABSTRACTAn ion mobility detector has dual drift regions respec-tively on either side of a centrally located reaction region andrespectively separated therefrom by dual shutter grids. Eachdrift region terminates in a Faraday cup. An ion acceleratingelectrical field gradient is provided between the Faraday cups sothat negative ions are drawn into one drift region and positivelycharged ions are drawn into the other drift region.