UV photoionization ion mobility spectrometry: Fundamentals and applications

Chen, Chuang; Jiang, Dandan; Li, Haiyang

doi:10.1016/j.aca.2019.05.018

Cited by 28 publications

(12 citation statements)

References 94 publications

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“…The drift tube used was constructed with alternately stacked stainless-steel electrode rings and polyether ether ketone (PEEK) insulating rings, forming an inner diameter of 10 mm and an outer dimension of 20 × 20 mm. The stainless-steel electrode rings and the PEEK insulating rings were sealed using a one-component epoxy heat-cured adhesive (DELO MONOPOX HT2860, Munich, Germany). , A commercially available radio frequency excited ultraviolet (RF UV) lamp (PKR106-6-14, Heraeus, Chesterfield, UK) with a photon energy of 10.6 eV was used as the ionization source, mounted axially in front of the drift tube. , The drift region and reaction region are separated by a Tyndall–Powell gate (TPG). The electric field was supplied in the drift tube via a series of stainless-steel electrodes that were inserted into a printed circuit board (PCB) and linked to the drift voltage by 2 MΩ surface mounted resistors.…”

Section: Methodsmentioning

confidence: 99%

Implementing of Fourier Deconvolution Multiplexing to Fast Polarity Switching Miniaturized Ion Mobility Spectrometer

Yang,

Ye,

et al. 2024

Anal. Chem.

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Ion mobility spectrometry (IMS) is a reliable and sensitive technique for the detection and analysis of compounds at the trace level. Depending on the chemical composition of the sample, compounds may be positively or negatively charged to form different polarity ions and detected in positive or negative polarity of the electric field. In order to detect multiple threats simultaneously with miniaturized devices, using a single detection unit to achieve high resolving power and high sensitivity is important. In this work, a miniaturized drift tube with fast polarity switching capabilities integrated with Fourier deconvolution multiplexing techniques is proposed for the first time as a means to improve the performance of ion mobility spectrometry. The sensitivity and resolving power are improved compared to traditional polarity switching signal averaging data acquisition methods. The displayed device had a high resolving power up to 52 at a drift length of 41 mm and a drift tube voltage of 2 kV. Trinitrotoluene (TNT), methamphetamine (MA), benzene, toluene, methyl tert-butyl ether (MTBE), acetic acid, and methylene chloride were evaluated using the proposed fast polarity switching multiplexing spectrometer and exhibited satisfied performance.

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Section: Methodsmentioning

confidence: 99%

Implementing of Fourier Deconvolution Multiplexing to Fast Polarity Switching Miniaturized Ion Mobility Spectrometer

Yang,

Ye,

et al. 2024

Anal. Chem.

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“…It has been widely used in airports, docks, stations, and other places. It is widely used in the detection of trace chemicals in drugs and poisons, 6,7 explosives, 8,9 chemical warfare agents, 10,11 and atmospheric pollutants 12,13 . The drift tube length limitation, which is one of the key factors in IMS resolving power, results in a resolving power of only 50–70 for existing commercial IMS instruments 14 .…”

Section: Introductionmentioning

confidence: 99%

Deconvolution of overlapping peaks in ion mobility spectrometry based on a multiobjective dynamic teaching‐learning‐based optimization

Tang

Bao

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale Because of its powerful analytical ability, ion mobility spectrometry (IMS) plays an important role in the field of mass spectrometry. However, one of the main defects of IMS is its low structural resolution, which leads to the phenomenon of peak overlap in the analysis of compounds with similar mass charge ratio. Methods A multiobjective dynamic teaching‐learning‐based optimization (MDTLBO) method was proposed to separate IMS overlapping peaks. This method prevents local optimization and identifies peak model coefficients efficiently. In addition, the position information of particles largely reflects the half‐peak width of IMS, which makes single peaks difficult to appear and coefficient identification easier. Results The performance comparison of MDTLBO with other deconvolution methods (genetic algorithm, improved particle swarm optimization algorithm, and dynamic inertia weight particle swarm optimization algorithm) shows that the maximum deconvolution error of MDTLBO is only 0.7%, which is much lower than that for the other three methods. In addition, robustness is a performance index that reflects the advantages and disadvantages of the algorithm. Conclusion MBTLBO is more robust than other algorithms for separating overlapping peaks. The algorithm can separate the heavily overlapped mobility peaks, produce better analysis results, and improve the resolution of IMS.

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“…The usage of dopants for non-laser ion sources is widely investigated. For example authors of [18] review published works showing photoionization signal increase up to 2 -3 orders. 63 Ni ionization source was used with hexachloroethane as dopant [19], VUV lamp ionization of nitro-molecules (10.0 eV photon) was used with acetone, benzene, toluene, n-hexane and ethanol [5].…”

Section: Introductionmentioning

confidence: 99%

Use of dopants for detection of vapors of explosives by laser field asymmetric ion mobility spectrometer

Akmalov

Chistyakov²,

Kotkovskii³

et al. 2022

Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies VI

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Ion mobility spectrometry (IMS) today figures prominently among analytical methods for detection of explosives and is widely used for transport security. This method is highly appreciated for capability to distinguish low quantity of different types of explosives at atmospheric pressure. The main obstacle for sensing some kinds of explosives is their very low vapor pressure so that the limit of detection of state-of-the-art IMS instrumentation 10-13 –10-14 g/cm3 lacks at least an order of magnitude. In this paper we combine promising UV laser radiation along with application of organic compounds (dopants) to improve ionization efficiency and vapor detection capabilities of IMS. Dopants with low ionization energy (toluene and 1-methylnaphtalene) were used for negative ion formation of nitro group-based explosives: trinitrotoluene (TNT), cyclotrimethylenetrinitramine (RDX) and pentaerythritol tetranitrate (PETN). Presence of dopants in the sample results in multiple growth of ion yield at laser intensities lower than 2 × 107 W/cm2. Limits of detection with dopant-assisted laser ionization (4.7 × 10-16 g/cm3 for RDX and 9.8 × 10-15 g/cm3 for PETN) show up to 2-fold improvement compared with no dopant case. Results propose a way to further improve sensitivity of detectors and reduce manufacturing costs by lowering requirements to laser pulse energy and using cheaper lasers.

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UV photoionization ion mobility spectrometry: Fundamentals and applications

Cited by 28 publications

References 94 publications

Implementing of Fourier Deconvolution Multiplexing to Fast Polarity Switching Miniaturized Ion Mobility Spectrometer

Implementing of Fourier Deconvolution Multiplexing to Fast Polarity Switching Miniaturized Ion Mobility Spectrometer

Deconvolution of overlapping peaks in ion mobility spectrometry based on a multiobjective dynamic teaching‐learning‐based optimization

Use of dopants for detection of vapors of explosives by laser field asymmetric ion mobility spectrometer

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