Time-Gated Pulsed Glow Discharge: Real-Time Chemical Speciation at the Elemental, Structural, and Molecular Level for Gas Chromatography Time-of-Flight Mass Spectrometry

A millisecond pulsed glow discharge is used as a versatile ion source for time-gated generation of elemental, structural, and molecular ions. The utility of this ion source for comprehensive chemical analysis of a series of aromatic and halogenated hydrocarbons is illustrated in this manuscript. To...

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Bibliographic Details
Published in:	Analytical chemistry (Washington) Vol. 75; no. 9; pp. 1983 - 1996
Main Authors:	Lewis, Cris L, Moser, Mathew A, Dale, Don E, Hang, Wei, Hassell, Christian, King, Fred L, Majidi, Vahid
Format:	Journal Article
Language:	English
Published:	Washington, DC American Chemical Society 01-05-2003
Subjects:	Analytical chemistry Chemicals Chemistry Chromatographic methods and physical methods associated with chromatography Chromatography Exact sciences and technology Gas chromatographic methods Gases Real time Spectrometric and optical methods Spectrum analysis Gas chromatography Chemical analysis Pulsed discharge Halogenated hydrocarbon Time of flight method Ion source Glow discharge Aromatic compound Mass spectrometry Speciation
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Summary:	A millisecond pulsed glow discharge is used as a versatile ion source for time-gated generation of elemental, structural, and molecular ions. The utility of this ion source for comprehensive chemical analysis of a series of aromatic and halogenated hydrocarbons is illustrated in this manuscript. To highlight the analytical utility of this transient ion source, it was connected to a gas chromatograph for the mass spectrometric determination of mixtures containing benzene, toluene, o-xylene, cymene, tert-butylbenzene, carbon tetrachloride, chloroform, chlorobenzene, tetrachlorethane, and dichlorobenzene. Explicit chemical analysis was accomplished by introducing the GC eluent into a pulsed glow discharge operating at a rate of 100 Hz with a 50% duty cycle. Using three independent digitizers for time-gated acquisition in three separate time regimes, nearly concurrent collection of elemental, structural, and molecular information was accomplished. In general, elemental information was obtained during the first 0.015 ms after the plasma onset; structural information, as ascertained from molecular fragmentation, was obtained during the plateau time regime when the plasma pulse is at a steady state, whereas molecular M+ and MH+ ions were obtained during the afterpeak time regime, that is, after the cessation of the plasma power pulse.
Bibliography:	istex:D201D0465161C8C5DF381A35B7BCCA980E4BDE65 ark:/67375/TPS-879CSCKC-C ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0003-2700 1520-6882
DOI:	10.1021/ac026242u