Ab initio studies of O-2(-) (H2O)(n) and O-3(-) (H2O)(n) anionic molecular clusters, n

Nicolai Christian Bork, T. Kurten, Martin Andreas Bødker Enghoff, Jens Olaf Pepke Pedersen, K. V. Mikkelsen, Henrik Svensmark

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    Abstract

    An ab initio study of gaseous clusters of O-2(-) and O-3(-) with water is presented. Based on thorough scans of configurational space, we determine the thermodynamics of cluster growth. The results are in good agreement with benchmark computational methods and existing experimental data. We find that anionic O-2(-)(H2O)n and O-3(-)(H2O)n clusters are thermally stabilized at typical atmospheric conditions for at least n = 5. The first 4 water molecules are strongly bound to the anion due to delocalization of the excess charge while stabilization of more than 4 H2O is due to normal hydrogen bonding. Although clustering up to 12 H2O, we find that the O-2 and O-3 anions retain at least ca. 80 % of the charge and are located at the surface of the cluster. The O-2(-) and O-3(-) speicies are thus accessible for further reactions. We consider the distributions of cluster sizes as function of altitude before finally, the thermodynamics of a few relevant cluster reactions are considered.
    Original languageEnglish
    JournalAtmospheric Chemistry and Physics
    Volume11
    Issue number14
    Pages (from-to)7133-7142
    ISSN1680-7316
    DOIs
    Publication statusPublished - 2011

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