Revisiting benzene cluster cations for the chemical ionization of dimethyl sulfide and select volatile organic compounds

Benzene cluster cations were revisited as a sensitive and selective reagent ion for the chemical ionization of dimethyl sulfide (DMS) and a select group of volatile organic compounds (VOCs). Laboratory characterization was performed using both a new set of compounds (i.e., DMS, β-caryophyllene) as w...

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Veröffentlicht in:Atmospheric measurement techniques 2016-04, Vol.9 (4), p.1473-1484
Hauptverfasser: Kim, Michelle J, Zoerb, Matthew C, Campbell, Nicole R, Zimmermann, Kathryn J, Blomquist, Byron W, Huebert, Barry J, Bertram, Timothy H
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Sprache:eng
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Zusammenfassung:Benzene cluster cations were revisited as a sensitive and selective reagent ion for the chemical ionization of dimethyl sulfide (DMS) and a select group of volatile organic compounds (VOCs). Laboratory characterization was performed using both a new set of compounds (i.e., DMS, β-caryophyllene) as well as previously studied VOCs (i.e., isoprene, α-pinene). Using a field deployable chemical-ionization time-of-flight mass spectrometer (CI-ToFMS), benzene cluster cations demonstrated high sensitivity (> 1 ncps ppt−1) to DMS, isoprene, and α-pinene standards. Parallel measurements conducted using a chemical-ionization quadrupole mass spectrometer, with a much weaker electric field, demonstrated that ion–molecule reactions likely proceed through a combination of ligand-switching and direct charge transfer mechanisms. Laboratory tests suggest that benzene cluster cations may be suitable for the selective ionization of sesquiterpenes, where minimal fragmentation ( 0.95, 10 s averages) over a wide range of sampling conditions.
ISSN:1867-8548
1867-1381
1867-8548
DOI:10.5194/amt-9-1473-2016