Ion mobility spectrometer with virtual aperture grid

Details Ion mobility spectrometer with virtual aperture grid Ion mobility spectrometer with virtual aperture grid

2008-12-16

2010-11-23

Nguyen, Keit T (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S281000

Reexamination Certificate

active

07838823

ABSTRACT:
An ion mobility spectrometer does not require a physical aperture grid to prevent premature ion detector response. The last electrodes adjacent to the ion collector (typically the last four or five) have an electrode pitch that is less than the width of the ion swarm and each of the adjacent electrodes is connected to a source of free charge, thereby providing a virtual aperture grid at the end of the drift region that shields the ion collector from the mirror current of the approaching ion swarm. The virtual aperture grid is less complex in assembly and function and is less sensitive to vibrations than the physical aperture grid.

REFERENCES:
patent: 6639213 (2003-10-01), Gillig et al.
patent: 7155812 (2007-01-01), Peterson et al.
patent: 7705296 (2010-04-01), Wu
patent: 2008/0121797 (2008-05-01), Wu
patent: 2008/0250877 (2008-10-01), Wu
Herbert H. Hill, Jr. et al, “Ion Mobility Spectrometry”, Analytical Chemistry, vol. 62, No. 23, 1990, pp. 1201A-1208A.
Laura M. Matz et al, “Evaluation of suspected interferents for TNT detection by ion mobility spectrometry”, Talanta, vol. 54, (2001) pp. 171-179.
Kent B. Pfeifer et al, “Measurement of Ion Swarm Distribution Functions in Miniature Low-Temperature Co-Fired Ceramic Ion Mobility Spectrometer Drift Tubes”, Analytical Chemistry, vol. 77, No. 16, 2005, pp. 5215-5220.
Kent B. Pfeifer, et al “Development of Rolled Miniature Drift Tubes Using Low Temperature Co-Fired Ceramics (LTCC),” 13thInternational Conference on Ion Mobility Spectrometry, Gatlinburg, TN 2004.
Spangler, et al, “Peak Shape Analysis and Plate Theory for Plasma Chromatography”, Analytical Chemistry vol. 47, No. 3 (1975) pp. 403-407.
Mahmoud Tabrizchi et al, “A novel electron source for negative ion mobility spectrometry”, International Journal of Mass Spectrometry, vol. 218, (2002) pp. 75-85.
Ching Wu, et al, “Construction and characterization of a high-flow, high-resolution ion mobility spectrometer for detection of explosives after personnel portal sampling”, Talanta, vol. 57, (2002) pp. 123-134.

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