Atmos. Chem. Phys. Discuss., 13, 10603-10620, 2013
www.atmos-chem-phys-discuss.net/13/10603/2013/
doi:10.5194/acpd-13-10603-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Proton affinities of candidates for positively charged ambient ions in the boreal forest
K. Ruusuvuori1, T. Kurtén2, I. K. Ortega1, J. Faust1,3, and H. Vehkamäki1
1Division of Atmospheric Sciences, Department of Physics, P.O. Box 64, 00014 University of Helsinki, Helsinki, Finland
2Laboratory of Physical Chemistry, Department of Chemistry, P.O. Box 55, 00014 University of Helsinki, Helsinki, Finland
3Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1322, USA

Abstract. The optimized structures and proton affinities of a total of 81 nitrogen-containing bases, chosen based on field measurements of ambient positive ions, were studied using the CBS-QB3 quantum chemical method. The results were compared to values given in the National Institute of Standards and Technology (NIST) Chemistry WebBook in cases where a value was listed. The computed values show good agreement with the values listed in NIST. Grouping the molecules based on their molecular formula, the largest calculated proton affinities for each group were also compared with experimentally observed ambient cation concentrations in the boreal forest. This comparison allows us to draw qualitative conclusions about the relative ambient concentrations of different nitrogen-containing organic base molecules.

Citation: Ruusuvuori, K., Kurtén, T., Ortega, I. K., Faust, J., and Vehkamäki, H.: Proton affinities of candidates for positively charged ambient ions in the boreal forest, Atmos. Chem. Phys. Discuss., 13, 10603-10620, doi:10.5194/acpd-13-10603-2013, 2013.
 
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