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Modular ion mobility spectrometer for explosives detection using corona ionization.

Kristyn M Roscioli1, Eric Davis, William F Siems

  • 1Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.

Analytical Chemistry
|June 21, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a novel ion mobility spectrometry (IMS) system for trace explosives detection. Utilizing a corona discharge ionization source, it offers a safer, regulatory-compliant alternative to radioactive sources, achieving high performance.

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Area of Science:

  • Analytical Chemistry
  • Instrument Design
  • Security Technology

Background:

  • Ion mobility spectrometry (IMS) is the leading technology for detecting trace explosives.
  • Current IMS systems often use radioactive nickel-63 ionization sources, posing safety and regulatory challenges.
  • Alternative ionization sources are needed to improve IMS system design.

Purpose of the Study:

  • To design and construct a lightweight, modular IMS system for trace explosives detection.
  • To utilize a corona discharge ionization source as a safer alternative to radioactive sources.
  • To optimize IMS design parameters through modeling and simulation.

Main Methods:

  • Development of an IMS system incorporating a corona discharge ionization source.
  • Utilizing modeling and simulation to investigate design alternatives and optimize parameters.
  • Acquiring simulated and experimental spectra for explosives like TNT and RDX.

Main Results:

  • Simulated spectra for 2,4,6-trinitrotoluene (TNT) and cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX) showed good agreement with experimental data.
  • Reduced mobilities for TNT and RDX were measured as 1.53 and 1.46 cm(2)/(V s) respectively, aligning with literature values.
  • The developed IMS system demonstrated high performance for explosives detection.

Conclusions:

  • A lightweight, modular IMS system using a corona discharge ionization source is feasible and effective for trace explosives detection.
  • Corona discharge ionization offers a safe, stable, and sensitive alternative to radioactive sources for IMS.
  • The study validates the use of modeling and simulation in optimizing IMS design for enhanced performance and safety.