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  • 1. Richardson, V.
    et al.
    Alcaraz, C.
    Geppert, Wolf
    Stockholm University, Faculty of Science, Department of Physics.
    Polášek, M.
    Romanzin, C.
    Sundelin, David
    Stockholm University, Faculty of Science, Department of Physics.
    Thissen, R.
    Tosi, P.
    Žabka, J.
    Ascenzi, D.
    The reactivity of methanimine radical cation (H2CNH.+) and its isomer aminomethylene (HCNH2.+) with methane2021In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 775, article id 138611Article in journal (Refereed)
    Abstract [en]

    Experimental and theoretical studies are presented on the reactions of the isomeric radical cations H2CNH+ and HCNH2+ with CH4. Ionic isomers were generated selectively by VUV dissociative photoionization of azetidine and cyclopropylamine precursors respectively. Both exclusively give H2CNH2+ plus CH3 as products, but differences are observed related to a competition between stripping and complex-mediated H-transfer. Astrochemical implications for Titan’s atmosphere are briefly discussed, where the presence of methanimine (H2CNH), a key prebiotic molecule and a potential precursor for tholins, is proposed on the basis of atmospheric models and the observation of CH2NH2+ ions in Cassini mass spectrometric data.

  • 2.
    Sundelin, David
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Ascenzi, D.
    Richardson, V.
    Alcaraz, C.
    Polášek, M.
    Romanzin, C.
    Thissen, R.
    Tosi, P.
    Žabka, J.
    Geppert, Wolf
    Stockholm University, Faculty of Science, Department of Physics.
    The reactivity of methanimine radical cation (H2CNH•+) and its isomer aminomethylene (HCNH2•+) with C2H42021In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 777, article id 138677Article in journal (Refereed)
    Abstract [en]

    Experimental and theoretical studies are presented on the reactivity of H2CNH'+ (methanimine) and HCNH2'+ (aminomethylene) with ethene (C2H4). Selective isomer generation is performed via dissociative photoionization of suitable neutral precursors and reactive cross sections and branching ratios are measured as a function of photon and collision energies. Differences between isomers' reactivity are discussed in light of ab-initio calculations on reaction mechanisms. The main products, for both isomers, are H-elimination, most likely occurring from covalently bound adducts (giving c-CH2CH2CHNH+/CH2NHCHCH2+) and H' atom transfer to yield H2CNH2+. The astrochemical implications of the results are briefly addressed.

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