04 Mar 2022
04 Mar 2022
Status: this preprint is currently under review for the journal AMT.

A high transmission axial ion mobility classifier for mass-mobility measurements of atmospheric ions

Markus Sebastian Leiminger1,3, Lukas Christoph Fischer1, Sophia Brilke2,b, Julian Resch2,a, Paul Winkler2, Armin Hansel1, and Gerhard Steiner1,4 Markus Sebastian Leiminger et al.
  • 1University of Innsbruck, Institute of Ion Physics and Applied Physics, 6020 Innsbruck, Austria
  • 2University of Vienna, Faculty of Physics, 1090, Vienna, Austria
  • 3Ionicon Analytik GmbH, 6020 Innsbruck, Austria
  • 4Grimm Aerosol Technik Ainring GmbH & Co. KG, 83404 Ainring, Germany
  • anow at: University of Basel, Department of Environmental Sciences, 4056 Basel, Switzerland
  • bnow at: IMS Nanofabrication GmbH, Austria

Abstract. We present an electrical mobility classifier for mass-mobility measurements of atmospheric ions. Size segregation coupled with mass spectrometric detection of naturally occurring ions in the atmosphere is challenging due to the low ion concentration. Conventional electrical mobility classifying devices were not yet coupled with mass spectrometry to resolve natural ion composition. This is either due to the insufficient transmission efficiency, or design concepts are incompatible with this application e.g., using high electric fields close to the inlets to push ions from high to low electric potential. Here, we introduce an axial ion mobility classifier, termed AMC, with the aim to achieve higher transmission efficiencies to segregate natural ions at reasonable sizing resolution. Similar, to the recently introduced principle of the high-pass electrical mobility filter (HP-EMF) presented by Bezantakos et al., 2015, and Surawski et al., 2017, ions are classified via an electric field that is opposed to the gas flow direction carrying the ions. Compared to the HP-EMF concept, we make use of sheath flows to improve the size resolution in the sub 3 nm range. With our new design we achieve a sizing resolution of 7 with a transmission efficiency of about 70 %.

Markus Sebastian Leiminger et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-29', Anonymous Referee #1, 10 Apr 2022
    • AC1: 'Reply on RC1', Markus Sebastian Leiminger, 10 May 2022
  • RC2: 'Comment on amt-2022-29', Anonymous Referee #2, 16 Apr 2022
    • AC2: 'Reply on RC2', Markus Sebastian Leiminger, 10 May 2022

Markus Sebastian Leiminger et al.

Markus Sebastian Leiminger et al.


Total article views: 406 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
319 71 16 406 30 5 5
  • HTML: 319
  • PDF: 71
  • XML: 16
  • Total: 406
  • Supplement: 30
  • BibTeX: 5
  • EndNote: 5
Views and downloads (calculated since 04 Mar 2022)
Cumulative views and downloads (calculated since 04 Mar 2022)

Viewed (geographical distribution)

Total article views: 384 (including HTML, PDF, and XML) Thereof 384 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
Latest update: 25 May 2022
Short summary
We developed an axial ion mobility classifier coupled to an atmospheric-pressure interface time-of-flight (APi-TOF) mass spectrometer to measure size segregated atmospheric ions. We characterize the performance of the novel instrument with bipolar electrospray generated ion mobility standards and compare the results with CFD simulations and a simplified numerical particle-tracking model. Ultimately, we report first mass-mobility measurements of atmospheric ions in Innsbruck, Austria.