New high-efficiency ion-trap mobility detection system for narcotics

William J. McGann

doi:10.1117/12.266761

17 February 1997 New high-efficiency ion-trap mobility detection system for narcotics

William J. McGann

Proceedings Volume 2937, Chemistry- and Biology-Based Technologies for Contraband Detection; (1997) https://doi.org/10.1117/12.266761
Event: Enabling Technologies for Law Enforcement and Security, 1996, Boston, MA, United States

Abstract

A new patented Ion Trap Mobility Spectrometer design is presented. Conventional IMS designs typically operate below 0.1 percent efficiency. This is due primarily to electric field driven, sample ion discharge on a shutter grid. Since 99.9 percent of the sample ions generated in the reaction region are lost int his discharge process, the sensitivity of conventional systems is limited. The new design provides greater detection efficiency than conventional designs through the use of an 'ion trap' concept. The paper describes the plasma and sample ion dynamics in the reaction region of the new detector and discusses the advantages of utilizing a 'field-free' space to generate sample ions with high efficiency. Fast electronic switching is described which is used to perturb the field-free space and pulse the sample ions into the drift region for separation and subsequent detection using pseudo real-time software for analysis and display of the data. One application for this new detector is now being developed, a portable, hand-held system with switching capability for the detection of drugs and explosives. Preliminary ion spectra and sensitivity data are presented for cocaine and heroin using a hand sniffer configuration.

Citation Download Citation

William J. McGann "New high-efficiency ion-trap mobility detection system for narcotics", Proc. SPIE 2937, Chemistry- and Biology-Based Technologies for Contraband Detection, (17 February 1997); https://doi.org/10.1117/12.266761

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