scholarly journals Novel ion drift tube for high-performance ion mobility spectrometers based on a composite material

2020 ◽  
Vol 23 (2) ◽  
pp. 75-81 ◽  
Author(s):  
André Ahrens ◽  
Janina Möhle ◽  
Moritz Hitzemann ◽  
Stefan Zimmermann
Keyword(s):  
Composite Material ◽  
Ion Mobility ◽  
Drift Tube ◽  
High Performance ◽  
Resolving Power ◽  
Continuous Increase ◽  
Ion Mobility Spectrometer ◽  
Ion Drift ◽  
Single Piece ◽  
Metal Sheets

Abstract Ion mobility spectrometers (IMS) are able to detect pptV-level concentrations of substances in gasses and in liquids within seconds. Due to the continuous increase in analytical performance and reduction of the instrument size, IMS are established nowadays in a variety of analytical field applications. In order to reduce the manufacturing effort and further enhance their widespread use, we have developed a simple manufacturing process for drift tubes based on a composite material. This composite material consists of alternating layers of metal sheets and insulator material, which are connected to each other in a mechanically stable and gastight manner. Furthermore, this approach allows the production of ion drift tubes in just a few steps from a single piece of material, thus reducing the manufacturing costs and efforts. Here, a drift tube ion mobility spectrometer based on such a composite material is presented. Although its outer dimensions are just 15 mm × 15 mm in cross section and 57 mm in length, it has high resolving power of Rp = 62 and detection limits in the pptV-range, demonstrated for ethanol and 1,2,3-trichloropropane.

scholarly journals Miniaturized high-performance drift tube ion mobility spectrometer

2019 ◽  
Vol 22 (2) ◽  
pp. 77-83 ◽  
Author(s):  
André Ahrens ◽  
Moritz Hitzemann ◽  
Stefan Zimmermann
Keyword(s):  
Ion Mobility ◽  
Drift Tube ◽  
High Performance ◽  
Ion Mobility Spectrometer

Analytical model for the signal-to-noise-ratio of drift tube ion mobility spectrometers

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ansgar T. Kirk ◽  
Alexander Bohnhorst ◽  
Stefan Zimmermann
Keyword(s):  
Ion Mobility ◽  
Drift Tube ◽  
Signal To Noise Ratio ◽  
Resolving Power ◽  
Operating Point ◽  
Optimum Operating ◽  
Signal To Noise ◽  
Experimental Parameters ◽  
Noise Ratio ◽  
Optimum Operating Point

Abstract While the resolving power of drift tube ion mobility spectrometers has been studied and modelled in detail over the past decades, no comparable model exists for the signal-to-noise-ratio. In this work, we develop an analytical model for the signal-to-noise-ratio of a drift tube ion mobility spectrometer based on the same experimental parameters used for modelling the resolving power. The resulting holistic model agrees well with experimental results and allows simultaneously optimizing both resolving power and signal-to-noise-ratio. Especially, it reveals several unexpected relationships between experimental parameters. First, even though reduced initial ion packet widths result in fewer injected ions and reduced amplifier widths result in more noise, the resulting shift of the optimum operating point when reducing both simultaneously leads to a constant signal-to-noise-ratio. Second, there is no dependence of the signal-to-noise-ratio at the optimum operating point on the drift length, as again the resulting shift of the optimum operating point causes all effects to compensate each other.

scholarly journals Determination of ethylene by field asymmetric ion mobility spectrometry

2020 ◽  
Vol 23 (2) ◽  
pp. 161-166
Author(s):  
Nattapong Chantipmanee ◽  
Peter C. Hauser
Keyword(s):  
Standard Deviation ◽  
Ion Mobility ◽  
Drift Tube ◽  
Limit Of Detection ◽  
Rectangular Pulse ◽  
Kiwi Fruit ◽  
Ion Mobility Spectrometer ◽  
Climacteric Fruit ◽  
Relative Standard

Abstract The determination of ethylene with a field asymmetric ion mobility spectrometer, which can easily be constructed in-house, is described. The device makes use of a Krypton lamp for ionization. A rectangular pulse of 500 Vpp at 1 MHz was employed as separation waveform in the drift tube rather than the commonly used less efficient bisinusoidal waveform. The calibration curve for the range from 670 ppb(V/V) to 67 ppm(V/V) was found to be highly linear with a correlation coefficient of r = 0.9999. The limit of detection was determined as 200 ppb(V/V). The reproducibility was 4% (relative standard deviation). The device was found to be suitable for the determination of ethylene given off by fruit; 6 types of climacteric fruit were tested, namely apples, bananas, kiwi fruit, nectarines, pears and plums.

scholarly journals Transmission of a Drift Tube Ion Mobility Spectrometer, Connected with a Mass Spectrometer

2015 ◽  
Vol 72 ◽  
pp. 278-282 ◽  
Author(s):  
D.M. Chernyshev ◽  
S.S. Poteshin ◽  
A.V. Karpov ◽  
Alexey A. Sysoev ◽  
Alexander A. Sysoev
Keyword(s):  
Mass Spectrometer ◽  
Ion Mobility ◽  
Drift Tube ◽  
Ion Mobility Spectrometer
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