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Ionic diffusion and mass discrimination effects in the new generation of short flow tube SIFT-MS instruments
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SYSNO ASEP 0329747 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ionic diffusion and mass discrimination effects in the new generation of short flow tube SIFT-MS instruments Title Efekty iontové difúze a hmotnostní diskriminace v přístrojích SIFT-MS nové generace s krátkou proudovou trubicí Author(s) Smith, D. (GB)
Pysanenko, A. (GB)
Španěl, Patrik (UFCH-W) RID, ORCIDSource Title International Journal of Mass Spectrometry. - : Elsevier - ISSN 1387-3806
Roč. 281, 1-2 (2009), s. 15-23Number of pages 9 s. Language eng - English Country NL - Netherlands Keywords SIFT-MS ; ionic diffusion ; mass discrimination ; trace gas analysis Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GA202/06/0776 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000263756000003 DOI 10.1016/j.ijms.2008.11.007 Annotation The major thrust of this paper is to describe how the current selected ion flow tube mass spectrometry (SIFT-MS) Profile 3 instruments can be configured to provide reliable quantification of the trace gases present in air and exhaled breath by accounting for the phenomena of differential diffusion of the analytical precursor and product ions in the flow tube reactor and mass discrimination in the ion sampling/analytical quadrupole mass spectrometer/detection system. If not accounted for these phenomena, especially the latter, can result in serious errors in quantification. Hence, it is described how H3O+ precursor ions are totally converted to a range of product ions within the mass-to-charge ratio, m/z, range from 18 to 201 and, thus, how the ion currents collected by the downstream ion sampling orifice disc and the count rates of these ions as determined by the analytical detection system at the various m/z are used to provide values ... Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2010
Number of the records: 1