Shutterless ion mobility spectrometer with fast pulsed electron source

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dc.identifier.uri Bunert, Erik ger Heptner, Andre ger Reinecke, T. ger Kirk, Ansgar T. ger Zimmermann, Stefan ger 2019-01-25T10:19:35Z 2019-01-25T10:19:35Z 2017
dc.identifier.citation Bunert, E.; Heptner, A.; Reinecke, T.; Kirk, A.T:; Zimmermann, S.: Shutterless ion mobility spectrometer with fast pulsed electron source. In: Review of Scientific Instruments 88 (2017), 024102. DOI: ger
dc.description.abstract Ion mobility spectrometers (IMS) are devices for fast and very sensitive trace gas analysis. The measuring principle is based on an initial ionization process of the target analyte. Most IMS employ radioactive electron sources, such as 63Ni or 3H. These radioactive materials have the disadvantage of legal restrictions and the electron emission has a predetermined intensity and cannot be controlled or disabled. In this work, we replaced the 3H source of our IMS with 100 mm drift tube length with our nonradioactive electron source, which generates comparable spectra to the 3H source. An advantage of our emission current controlled nonradioactive electron source is that it can operate in a fast pulsed mode with high electron intensities. By optimizing the geometric parameters and developing fast control electronics, we can achieve very short electron emission pulses for ionization with high intensities and an adjustable pulse width of down to a few nanoseconds. This results in small ion packets at simultaneously high ion densities, which are subsequently separated in the drift tube. Normally, the required small ion packet is generated by a complex ion shutter mechanism. By omitting the additional reaction chamber, the ion packet can be generated directly at the beginning of the drift tube by our pulsed nonradioactive electron source with only slight reduction in resolving power. Thus, the complex and costly shutter mechanism and its electronics can also be omitted, which leads to a simple low-cost IMS-system with a pulsed nonradioactive electron source and a resolving power of 90. ger
dc.language.iso eng ger
dc.publisher College Park, MA : American Institute of Physics (AIP)
dc.relation.ispartofseries Review of Scientific Instruments 88 (2017) ger
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. ger
dc.subject Atmospheric composition eng
dc.subject Photoionization eng
dc.subject X-rays eng
dc.subject Detection limit eng
dc.subject Gas discharges eng
dc.subject Electron sources eng
dc.subject Tritium eng
dc.subject Chemical compounds and components eng
dc.subject Radioactive material eng
dc.subject Surface collisions eng
dc.subject.ddc 621,3 | Elektrotechnik, Elektronik ger
dc.subject.ddc 530 | Physik ger
dc.title Shutterless ion mobility spectrometer with fast pulsed electron source eng
dc.type article ger
dc.type Text ger
dc.relation.doi 10.1063/1.4976021
dc.description.version publishedVersion ger
tib.accessRights frei zug�nglich ger

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