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Electron-triggered chemistry in HNO3/H2O complexes

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    0473612 - ÚFCH JH 2018 RIV GB eng J - Článek v odborném periodiku
    Lengyel, Jozef - Ončák, M. - Fedor, Juraj - Kočišek, Jaroslav - Pysanenko, Andriy - Beyer, M. K. - Fárník, Michal
    Electron-triggered chemistry in HNO3/H2O complexes.
    Physical Chemistry Chemical Physics. Roč. 19, č. 19 (2017), s. 11753-11758. ISSN 1463-9076. E-ISSN 1463-9084
    Grant CEP: GA ČR(CZ) GA15-12386S
    Institucionální podpora: RVO:61388955
    Klíčová slova: electron-triggered chemistry * acid-water clusters * gas-phase reactions
    Obor OECD: Physical chemistry
    Impakt faktor: 3.906, rok: 2017
    Způsob publikování: Open access

    Polar stratospheric clouds, which consist mainly of nitric acid containing ice particles, play a pivotal role in stratospheric chemistry. We investigate mixed nitric acid-water clusters (HNO3)(m)( H2O)(n), m approximate to 1-6, n approximate to 1-15, in a laboratory molecular beam experiment using electron attachment and mass spectrometry and interpret our experiments using DFT calculations. The reactions are triggered by the attachment of free electrons (0-14 eV) which leads to subsequent intracluster ion-molecule reactions. In these reactions, the nitrate anion NO3- turns out to play the central role. This contradicts the electron attachment to the gas-phase HNO3 molecule, which leads almost exclusively to NO2-. The nitrate containing clusters are formed through at least three different reaction pathways and represent terminal product ions in the reaction cascade initiated by the electron attachment. Besides, the complex reaction pathways represent a new hitherto unrecognized source of atmospherically important OH and HONO molecules.
    Trvalý link: http://hdl.handle.net/11104/0273896

     
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