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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Apr 2019

Research article | 30 Apr 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Characterisation of the transfer of cluster ions through an Atmospheric Pressure interface Time-of-Flight mass spectrometer with hexapole ion guides

Markus Leiminger1,2, Stefan Feil2, Paul Mutschlechner2, Arttu Ylisirniö3, Daniel Gunsch2, Lukas Fischer1, Alfons Jordan2, Siegfried Schobesberger3, Armin Hansel1,2, and Gerhard Steiner1,4 Markus Leiminger et al.
  • 1University of Innsbruck, Institute of Ion Physics and Applied Physics, 6020 Innsbruck, Austria
  • 2IoniconAnalytik GmbH, 6020 Innsbruck, Austria
  • 3University of Eastern Finland, Department of Applied Physics, 70211 Kuopio, Finland
  • 4Grimm Aerosol Technik Ainring GmbH & Co. KG, 83404 Ainring, Germany

Abstract. Here we present an alternative approach of an Atmospheric-Pressure interface (APi) Time-Of-Flight mass spectrometer for the study of atmospheric ions and cluster ions, the so-called ioniAPi-TOF. The novelty is the use of two hexapoles as ion guides within the APi. As we will show, hexapoles can accept and transmit a broad mass range enabling the study of small precursor ions and heavy cluster ions at the same time. Weakly bound cluster ions can easily de-cluster during ion transfer depending on the voltages applied to the ion transfer optics. With the example system of H3O+(H2O)n=0–3, we estimate that cluster ions with higher binding energies than 17 kcal/mol can be transferred through the APi without significant fragmentation, which is considerably lower than about 25 kcal/mol estimated from the literature for APi-TOFs with quadrupole ion guides. In contrast to the low fragmenting ion transfer, the hexapoles can be set to a high fragmenting declustering mode for collision-induced dissociation (CID) experiments as well. The ion transmission efficiency over a broad mass range was determined to be in the order of 1 %, which is comparable to existing instrumentation. From measurements under well-controlled conditions during the CLOUD experiment, we demonstrate the instrument's performance and present results from an inter-comparison with a quadrupole based APi-TOF.

Markus Leiminger et al.
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Markus Leiminger et al.
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Short summary
We introduce an alternative type of Atmospheric Pressure-interface Time-Of-Flight mass spectrometer (APi-TOF) with hexapole instead of quadrupole ion guides to study cluster ions. The transfer of cluster ions through the hexapole ion guides was characterised with focus on transmission efficiency, mass range and fragmentation of cluster ions. We further compared our results with APi-TOFs using quadrupole ion guides.
We introduce an alternative type of Atmospheric Pressure-interface Time-Of-Flight mass...