&lt;title&gt;New high-efficiency ion trap mobility detection system for narcotics and explosives&lt;/title&gt;

McGann, William J.; Jenkins, Anthony; Ribiero, K.; Napoli, J.

doi:10.1117/12.171280

Cited by 8 publications

(4 citation statements)

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“…In order to reach significantly smaller initial ion packet widths, we use a so-called field switching shutter ,, for our high-resolution IMS, which has zero cutting width and no field inhomogeneities . This way, initial ion packet widths as low as 5 μs are achievable without measurably discriminating slower ions .…”

Section: Tristate Ion Shutter Methodsmentioning

confidence: 99%

High-Resolution High Kinetic Energy Ion Mobility Spectrometer Based on a Low-Discrimination Tristate Ion Shutter

et al. 2018

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High kinetic energy ion mobility spectrometry (HiKE-IMS) allows for sensitive trace gas analysis within seconds, mitigating many disadvantages of standard ion mobility spectrometers through operation at reduced pressure and high electric field strengths. However, these advantages usually come at the cost of reduced resolving power, ranging from a maximum of 75 down to 50 at a reduced field strength of 120 Td for the original device. In this work, we present an extended theory for HiKE-IMS resolving power and a novel tristate ion shutter principle able to achieve initial ion packet widths of 1 μs without significant mobility discrimination. Such an ultrashort injection time allows for improving the resolving power of the HiKE-IMS to 140 for a wide range of reduced electric field strengths. With this resolving power, separating all ion species generated from a mixture of benzene, toluene, and xylene is possible. Furthermore, a resolving power of 140 is sufficient to partially separate isotopologues under high electric field strengths.

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Section: Tristate Ion Shutter Methodsmentioning

confidence: 99%

High-Resolution High Kinetic Energy Ion Mobility Spectrometer Based on a Low-Discrimination Tristate Ion Shutter

et al. 2018

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“…Hallowell et al (170) reported an RDX detection limit of approximatedly 20 pg using a PCP Model 110, and Davies et al (50) reported calibration studies using the same device that, for instance, yielded 95% confidence limits on an observation of 5 pg RDX of ±14 pg. McGann et al (171,172), describing the application of the IonTrack Ion Trap Mobility Spectrometer to narcotics and explosives, mention only a 115-pg detection limit for cocaine.…”

Section: Ion Mobility Spectrometrymentioning

confidence: 99%

EXPLOSIVES DETECTION: A Challenge for Physical Chemistry

Steinfeld

Wormhoudt

1998

Annu. Rev. Phys. Chem.

397

242

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The detection of explosives, energetic materials, and their associated compounds for security screening, demining, detection of unexploded ordnance, and pollution monitoring is an active area of research. A wide variety of detection methods and an even wider range of physical chemistry issues are involved in this very challenging area. This review focuses on techniques such as optical and mass spectrometry and chromatography for detection of trace amounts of explosives with short response times. We also review techniques for detecting the decomposition fragments of these materials. Molecular data for explosive compounds are reviewed where available.

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“…However, the short time frame of spectra require fast mass spectrometers for fully nested operation [65,66]. Ion yield can be vastly increased by using multiplexing [67][68][69][70][71], a field switching shutter for compatible ion sources [72,73] or injection from an ion trap when operating at reduced pressure [74]. There is no inherent limit to the ion mobility range of a drift tube IMS -when measuring negative ions in gases not capturing electrons such as nitrogen, even an electron peak can be observed [75,76], while the upper limit is only given by the ability to bring ions into the gas phase.…”

Section: =mentioning

confidence: 99%

Ultra-high-resolution ion mobility spectrometry—current instrumentation, limitations, and future developments

et al. 2019

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With recent advances in ionization sources and instrumentation, ion mobility spectrometers (IMS) have transformed from a detector for chemical warfare agents and explosives to a widely used tool in analytical and bioanalytical applications. This increasing measurement task complexity requires higher and higher analytical performance and especially ultra-high resolution. In this review, we will discuss the currently used ion mobility spectrometers able to reach such ultra-high resolution, defined here as a resolving power greater than 200. These instruments are drift tube IMS, travelling wave IMS, trapped IMS and field asymmetric or differential IMS. The basic operating principles and the resulting effects of experimental parameters on resolving power are explained and compared between the different instruments. This allows understanding the current limitations of resolving power and how ion mobility spectrometers may progress in the future.

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<title>New high-efficiency ion trap mobility detection system for narcotics and explosives</title>

Cited by 8 publications

References 0 publications

High-Resolution High Kinetic Energy Ion Mobility Spectrometer Based on a Low-Discrimination Tristate Ion Shutter

High-Resolution High Kinetic Energy Ion Mobility Spectrometer Based on a Low-Discrimination Tristate Ion Shutter

EXPLOSIVES DETECTION: A Challenge for Physical Chemistry

Ultra-high-resolution ion mobility spectrometry—current instrumentation, limitations, and future developments

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