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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-502
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-502
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Feb 2020

Submitted as: research article | 04 Feb 2020

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This preprint is currently under review for the journal AMT.

HOM cluster decomposition in APi-TOF mass spectrometers

Tommaso Zanca1, Jakub Kubečka1, Evgeni Zapadinsky1, Monica Passananti1,2, Theo Kurtén3, and Hanna Vehkamäki1 Tommaso Zanca et al.
  • 1Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
  • 2Dipartimento di Chimica, Università di Torino, via Giuria 5, 10125 Torino, Italy
  • 3Institute for Atmospheric and Earth System Research/Chemistry, Faculty of Science, University of Helsinki, P.O. Box 55, 00014, Helsinki, Finland

Abstract. Identification of atmospheric molecular clusters and measurement of their concentrations by APi-TOF mass spectrometers may be affected by systematic error due to possible decomposition of clusters inside the instrument. Here, we perform numerical simulations of decomposition in an APi-TOF and formation in the atmosphere of a set of clusters which involve a representative kind of highly-oxygenated organic molecule (HOM), with molecular formula C10H16O8. This elemental composition corresponds to one of the most common mass peaks observed in experiments on ozone-initiated autoxidation of α-pinene. Our results show that decomposition is highly unlikely for the considered clusters, provided their bonding energy is large enough to allow formation in the atmosphere in the first place.

Tommaso Zanca et al.

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Tommaso Zanca et al.

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Latest update: 17 Feb 2020
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Short summary
In this paper we quantify (using a statistical model) the probability of decomposition (or fragmentation) of a representative class of HOM clusters in a APi-TOF mass spectrometer. This is important because it quantifies the systematic error on measurements in APi-TOF due to cluster decomposition. The results (specific for our selected clusters) show that decomposition is negligible, provided their bonding energy is large enough to allow formation in the atmosphere in the first place.
In this paper we quantify (using a statistical model) the probability of decomposition (or...
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