Planar Drift Tube for Ion Mobility Spectrometry

Eiceman, Gary A.; Schmidt, H.; Rodriguez, Jaime E.; White, Corey R.; Krylov, Evgeny V.; Stone, John A.

doi:10.1080/10739140701436520

Cited by 13 publications

(12 citation statements)

References 37 publications

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“…Compared to former work published on laser ion mobility spectrometry, we have utilized a rectangular drift tube design as it allows for a relatively long interaction path of the UV laser beam with the analyte molecules in the entrance region of the LIMS drift tube [12,13]. Furthermore, a compact tunable solid state laser was used instead of a tunable dye laser pumped by a Nd:YAG laser.…”

Section: Instrumentationmentioning

confidence: 99%

Hydrocarbon detection using laser ion mobility spectrometry

Oberhüttinger¹,

Langmeier²,

Oberpriller³

et al. 2009

Int. J. Ion Mobil. Spec.

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A Laser Ion Mobility Spectrometer has been set up and trace detection experiments have been performed. We find that laser ionization almost selectively ionizes aromatic hydrocarbons. Aliphatic hydrocarbons are only laser-ionized in case these contain conjugated double bonds. As, in contrast to radioactive ion mobility spectrometry, background air constituents and air contaminants cannot be ionized, drift spectra are inherently simple and easily interpretable. We show that a laser ion mobility spectrometer can be operated in two basically different modes, either using tunable or fixedfrequency laser sources. In the tunable laser mode, aromatic hydrocarbons can be detected in the positive mode and distinguished from each other on account of their different excitation wavelengths and ion drift times. In the fixedfrequency mode, specially chosen and intentionally admitted aromatic hydrocarbons are laser ionized and the primary ionization is transferred to non-aromatic species by means of atmospheric pressure chemical ionization. In this latter mode of operation nitroglycerin and triacetone triperoxide, two nonaromatic high explosives, could be detected.

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Section: Instrumentationmentioning

confidence: 99%

Hydrocarbon detection using laser ion mobility spectrometry

Oberhüttinger¹,

Langmeier²,

Oberpriller³

et al. 2009

Int. J. Ion Mobil. Spec.

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“…In the literature, various approaches to construct drift tubes have been presented. − In recent years, there has been a trend toward PCB-based drift tubes due to their excellent performance and low cost. ,,, Classically, these systems use flexible or rigid, 2-layer printed circuit boards arranged either vertically, forming stacked electrodes, or horizontally to the drift direction of the ions, forming coplanar electrodes. With the drift region consisting of stacked electrodes, each electrode is formed by a single PCB with a metallized hole (Figure , top) separated by an isolating spacer.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…6−9 In recent years, there has been a trend toward PCB-based drift tubes due to their excellent performance and low cost. 10,11,6,12 Classically, these systems use flexible or rigid, 2-layer printed circuit boards arranged either vertically, forming stacked electrodes, or horizontally to the drift direction of the ions, forming coplanar electrodes.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Toward Compact High-Performance Ion Mobility Spectrometers: Ion Gating in Ion Mobility Spectrometry

2021

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Printed circuit board (PCB) based drift tube ion mobility spectrometers enable the use of state-of-the-art production techniques to manufacture compact devices with excellent performance at minimum cost. The new PCB ion mobility spectrometer (PCB-IMS) presented here is equipped with either a 140 MBq tritium or a 95 MBq nickel-63 ionization source and consists of a combination of horizontally arranged 6-layer PCBs for the drift and reaction regions and vertically arranged PCBs for interfacing the ionization source, ion shutter, and detector. The design allows the reproducible manufacturing and thus comparison of different IMS topologies. Here, we investigate different ion shutters, field-switching, Bradbury-Nielsen, and tristate and their effects on resolving power and limits of detection considering two different ionization region geometries and ionization sources, tritium and nickel-63. It is shown that the high resolving power of R P > 80 at low drift voltage of 3 kV and short drift length of 50 mm can be achieved independent of the used ion shutter mechanism and reaction region geometry. While the resolving power of all ion shutters is excellent, the Bradbury-Nielsen shutter shows a pronounced discrimination of slow ion species when using short shutter opening times for small initial ion cloud widths, as required for high resolving power. Thus, the intensity of the proton-bound dimer of 2-pentanone is reduced by 30% compared to the signal intensity obtained with both the field-switching and tristate shutter. The detection limits employing the Bradbury-Nielsen shutter and a 50 mm reaction region as required for nickel-63 are 58 pptv for the protonated monomer and 3.4 ppbv for the proton-bound dimer of 2-pentanone. The detection limits achieved with the tristate shutter utilizing the same reaction region are slightly higher for the protonated monomer at 68 pptv, but lower for the proton-bound dimer at 2 ppbv due to the advanced ion shutter principle not discriminating slow ions. However, the lowest detection limits of 13 pptv and 301 pptv can be achieved with the field-switching shutter and a 2 mm reaction region, sufficient for a tritium ionization source.

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“…The copper on their surface can be structured using lithographic processes to generate the necessary geometries for electrodes and feedthroughs with extremely high precision. Even though a printed circuit board IMS has been reported [11], this approach has not yet gained wide recognition. One of the main disadvantages of PCB manufacturing is the limitation to flat structures.…”

Section: Printed Circuit Board Imsmentioning

confidence: 99%

“…One of the main disadvantages of PCB manufacturing is the limitation to flat structures. Due to this, the setup reported in [11] uses only electrodes on the top and the bottom of the drift tube, causing deformations of the electrical field close to the sides. To overcome this limitation, we developed a drift tube based on the results presented in the simulation section, which is manufactured completely from printed circuit boards.…”

Section: Printed Circuit Board Imsmentioning

confidence: 99%

Simulation aided design of a low cost ion mobility spectrometer based on printed circuit boards

Bohnhorst

Kirk

Zimmermann

2016

Int. J. Ion Mobil. Spec.

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Miniaturized low-cost drift tubes with high analytical performance are a key component for the design of powerful and mass-deployable hand-held ion mobility spectrometers. Thus, a simple model that estimates the influence of the geometrical dimensions on the analytical performance is highly desirable for an effective design process. In this work, we present a simple procedure to predict peak distortion based on only the electrical field distribution inside the drift tube, which can be rapidly simulated using the finite element method. A simulation of the ion motion is not required. Based on these results, we developed an ion mobility spectrometer manufactured entirely from standard printed circuit boards (PCB). Since no additional components were used apart from electrical and gas connectors, ion source and metal grids, the presented ion mobility spectrometer is very simple and inexpensive. Nevertheless, the design provides a resolving power of 82 at a drift length of 50 mm and a drift voltage of 3 kV using a tritium ion source and a field switching shutter. The limits of detection for one second of averaging are 80 ppt v for acetone, 35 ppt v for dimethyl methylphosphonate and 180 ppt v for methyl salicylate.

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Planar Drift Tube for Ion Mobility Spectrometry

Cited by 13 publications

References 37 publications

Hydrocarbon detection using laser ion mobility spectrometry

Hydrocarbon detection using laser ion mobility spectrometry

Toward Compact High-Performance Ion Mobility Spectrometers: Ion Gating in Ion Mobility Spectrometry

Simulation aided design of a low cost ion mobility spectrometer based on printed circuit boards

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