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• W2020954194 abstract "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." @default.
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• W2020954194 date "2009-10-01" @default.
• W2020954194 modified "2023-10-09" @default.
• W2020954194 title "A study of the performance of an ion shutter for drift tubes in atmospheric pressure ion mobility spectrometry: Computer models and experimental findings" @default.
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• W2020954194 doi "https://doi.org/10.1063/1.3242276" @default.
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