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Bunert, Erik [Author]; Heptner, Andre [Author]; Kirk, Ansgar T. [Author]; Käbein, Oliver [Author]; Zimmermann, Stefan [Author]; Kusch, Alexander [Author]; Wurz, Marc Christopher [Author]

Pulsed electron source for atmospheric pressure chemical ionization in ion mobility spectrometry - [accepted Version]

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  • Media type: Text; Electronic Conference Proceeding
  • Title: Pulsed electron source for atmospheric pressure chemical ionization in ion mobility spectrometry
  • Contributor: Bunert, Erik [Author]; Heptner, Andre [Author]; Kirk, Ansgar T. [Author]; Käbein, Oliver [Author]; Zimmermann, Stefan [Author]; Kusch, Alexander [Author]; Wurz, Marc Christopher [Author]
  • imprint: Piscataway, NJ : IEEE, 2017
  • Issue: accepted Version
  • Language: English
  • DOI: https://doi.org/10.15488/4417; https://doi.org/10.1109/IVNC.2017.8051563
  • Keywords: field emission ; emission current control ; non-radioacitve electron source ; thermionic emission ; APCI ; ion mobility spectrometry ; pulsed electron emission
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: Ion mobility spectrometers (IMS) are measurement devices for fast and ultra-sensitive trace gas analysis. Most IMS employ radioactive electron sources, such as 3 H or 63 Ni, to provide free electrons with high kinetic energy at atmospheric pressure for initiating a chemical gas phase ionization of the analytes. The disadvantage of these radioactive materials are legal restrictions and the electron emission cannot be adjusted or turned off. Therefore, we developed a non-radioactive electron source and replaced the 3 H-source of our existing IMS, leading to comparable spectra. An advantage of our non-radioactive electron source is that it can operate in a fast pulsed mode. By optimizing the geometric parameters and developing fast control electronics, we can achieve short electron emission pulses with high intensities and adjustable pulse width down to a few nanoseconds. This allows to control the ionization process, which can enhance the analytical performance of the IMS. Furthermore, a miniaturized non-radioactive electron source is desirable, e.g. for hand-held IMS devices. Therefore, we developed an emission current control for field emitter cathodes and investigated their suitability for this application.
  • Access State: Open Access