FIELD-SWITCHING REPELLER FLOWING ATMOSPHERIC-PRESSURE AFTERGLOW DRIFT TUBE ION MOBILITY SPECTROMETRY

Mohsen Latif, Xi Chen, Viraj Gandhi, Carlos Larriba-Andaluz, Gerardo Gamez Goytia

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, a field-switching (FS) technique is employed with a flowing atmospheric pressure afterglow (FAPA) source in a Drift Tube Ion Mobility Spectrometry (DTIMS). The premise is to incorporate a tip-repeller electrode as a substitute for the Bradbury-Nielsen gate (BNG) so as to overcome corresponding disadvantages of the BNG, including the Gate Depletion Effect (GDE). The DTIMS spectra were optimized in terms of peak shape and full width by inserting an aperture at the DTIMS inlet that was used to control the neutral molecules penetration into the separation region, thus preventing neutral-ion reactions inside. The FAPA and repeller’s experimental operating conditions including drift and plasma gas flow rates, pulse injection times, repeller positioning and voltage, FAPA current and effluent angle were optimized. Ion mobility spectra of selected compounds were captured, and corresponding reduced mobility values were calculated and compared with literature. The six-fold improvem
Original languageEnglish
Pages (from-to)635 - 648
JournalJournal of the American Society for Mass Spectrometry
StatePublished - Mar 2022

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