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A study of the performance of an ion shutter for drift tubes in atmospheric pressure ion mobility spectrometry: Computer models and experimental findings

Rev. Sci. Instrum. 80, 103103 (2009); doi:10.1063/1.3242276

Published 13 October 2009

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Fatkhulla K. Tadjimukhamedov,1 Jaroslaw Puton,2 John A. Stone,3 and Gary A. Eiceman1
1Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA
2Department of Environmental Sciences, Laboratory of Applied Environmental Chemistry, University of Kuopio, Mikkeli FIN-50100, Finland
3Department of Chemistry, Queens University, Kingston, Ontario K7L 3N6, Canada
Ion mobility spectra are initiated when ions, derived from a sample, are pulsed or injected through ion shutters into a drift region. The effect on signal intensity from electric fields arising from the shutter grids (Es) and a superimposed electric field of the drift tube (Ed) was determined experimentally and simulated computationally for ion motion at ambient pressure. The combination of these two fields influenced shutter performance in three ways: (1) intensity of an ion peak was suppressed by increased current in the baseline due to continuous leakage of ions into the drift region from insufficient Es to block ion motion when needed, at a given value of Ed; (2) the ion shutter provided maximum peak intensity with some optimal ratio of Es/Ed when ions were fully blocked except using the injection time; (c) the signal intensity was reduced when the blocking voltage of the ion shutter exceeded this optimal Es/Ed ratio from ion depletion at the shutter grids. The optimal ratio from the computer models was equal to 1.50, whereas a value of 2.50 was obtained from the experimental findings. This difference was attributed to nonideal geometry with the grids of the shutter and the conducting elements in the drift tube establishing both Es and Ed. As both the experimental and modeling results demonstrated, a mobility dependence of ion yield from the ionization source was found to cause a mobility dependent ion signal at the collector electrode. ©2009 American Institute of Physics
History: Received 16 July 2009; accepted 13 September 2009; published 13 October 2009
Permalink: http://link.aip.org/link/?RSINAK/80/103103/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.81.+a
    Electron and ion spectrometers
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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