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Step Towards Modeling the Atmosphere of Titan: State-Selected Reactions of O+ with Methane
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SYSNO ASEP 0459443 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Step Towards Modeling the Atmosphere of Titan: State-Selected Reactions of O+ with Methane Tvůrce(i) Hrušák, Jan (UFCH-W) RID, ORCID
Paidarová, Ivana (UFCH-W) RID, ORCIDZdroj.dok. Origins of Life and Evolution of the Biosphere - ISSN 0169-6149
Roč. 46, č. 4 (2016), s. 419-424Poč.str. 6 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova methane oxidation ; excited states ; transition dipole moments Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000385182800008 EID SCOPUS 84962786981 DOI 10.1007/s11084-016-9503-4 Anotace Methane conversion and in particular the formation of the C-O bond is one of fundamental entries to organic chemistry and it appears to be essential for understanding parts of atmospheric chemistry of Titan, but, in broader terms it might be also relevant for Earth-like exoplanets. Theoretical study of the reactions of methane with atomic oxygen ion in its excited electronic states requires treating simultaneously at least 19 electronic states. Development of a computational strategy that would allow chemically reasonable and computationally feasible treatment of the CH4 (X)/O+ (2D, 2P) system is by far not trivial and it requires careful examination of all the complex features of the corresponding 19 potential energy surfaces. Before entering the discussion of the rich (photo) chemistry, inspection of the long range behavior of the system with focus on electric dipole transition moments is required. Our calculations show nonzero probability for the reactants to decay before entering the multiple avoided crossings region of the [CH4 + O → products]+ reaction. For the CH4/O+ (2P) system non-zero transition moment probabilities occur over the entire range of considered C-O distances (up to 15 Å), while for the CH4/O+ (2D) system these probabilities are lower by one order of magnitude and were found only at C-O distances smaller than 6 Å. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2017
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