A compact high resolution ion mobility spectrometer for fast trace gas analysis

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dc.identifier.uri http://dx.doi.org/10.15488/63
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/81
dc.contributor.author Kirk, Ansgar T.
dc.contributor.author Allers, Maria
dc.contributor.author Cochems, Philipp
dc.contributor.author Langejuergen, Jens
dc.contributor.author Zimmermann, Stefan
dc.date.accessioned 2015-10-22T16:07:34Z
dc.date.available 2015-10-22T16:07:34Z
dc.date.issued 2013
dc.identifier.citation Kirk, Ansgar T.; Allers, Maria; Cochems, Philipp; Langejuergen, Jens; Zimmermann, Stefan: A compact high resolution ion mobility spectrometer for fast trace gas analysis. In: Analyst 138 (2013), Nr. 18, S. 5200-5207. DOI: http://dx.doi.org/10.1039/C3AN00231D
dc.description.abstract Drift tube ion mobility spectrometers (IMS) are widely used for fast trace gas detection in air, but portable compact systems are typically very limited in their resolving power. Decreasing the initial ion packet width improves the resolution, but is generally associated with a reduced signal-to-noise-ratio (SNR) due to the lower number of ions injected into the drift region. In this paper, we present a refined theory of IMS operation which employs a combined approach for the analysis of the ion drift and the subsequent amplification to predict both the resolution and the SNR of the measured ion current peak. This theoretical analysis shows that the SNR is not a function of the initial ion packet width, meaning that compact drift tube IMS with both very high resolution and extremely low limits of detection can be designed. Based on these implications, an optimized combination of a compact drift tube with a length of just 10 cm and a transimpedance amplifier has been constructed with a resolution of 183 measured for the positive reactant ion peak (RIP+), which is sufficient to e.g. separate the RIP+ from the protonated acetone monomer, even though their drift times only differ by a factor of 1.007. Furthermore, the limits of detection (LODs) for acetone are 180 ppt(v) within 1 s of averaging time and 580 pptv within only 100 ms. eng
dc.language.iso eng eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries Analyst 138 (2013), Nr. 18
dc.rights CC BY-NC 3.0 Unported
dc.rights.uri http://creativecommons.org/licenses/by-nc/3.0/
dc.subject Ion mobility spectrometry eng
dc.subject high resolution eng
dc.subject compact eng
dc.subject isomers eng
dc.subject isotopes eng
dc.subject.ddc 540 | Chemie ger
dc.title A compact high resolution ion mobility spectrometer for fast trace gas analysis eng
dc.type article
dc.type Text
dc.relation.issn 0003-2654
dc.relation.doi http://dx.doi.org/10.1039/C3AN00231D
dc.bibliographicCitation.firstPage 5200
dc.bibliographicCitation.lastPage 5207
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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