![]() ![]() In particular, the hydrogenation of CO 2 by technologies based on green electricity allows both the storage of renewable energy in value-added compounds and recycling CO 2, thus paving the way to decarbonise the energy system. In the latter field, the efficient conversion of greenhouse gases into value-added chemicals is a central topic in current research on renewable and sustainable energies ( Wang et al., 2017). The chemistry of the CO 2 + cation attracts much attention because of the presence of this ion in planetary atmospheres (with particular reference to the Earth and Mars Matta et al., 2013 Tenewitz et al., 2018 as well as in laboratory plasmas for energetic and environmental applications Snoeckx and Bogaerts, 2017). We find that the dominant channel is the production of CD 4 +, followed by DOCO + and CD 3 +, as a minor endothermic channel. Concerning the product branching ratios ( CD 4 +/ CD 3 +/DOCO +) there is substantial disagreement among the values reported in the literature. We find that the reactivity depends on the reagent collision energy, but not so much on the vibrational excitation of CO 2 +. The experiments were performed by a guided ion beam apparatus coupled to synchrotron radiation in the VUV energy range to produce vibrationally excited ions. In this paper, we investigate the reaction of CO 2 + with methane by changing either the kinetic energy of CO 2 + or its vibrational excitation. However, putting the same amount of energy in a different form may affect the reactivity differently. Energy, in the form of kinetic or internal excitation of reagents, influences chemical reactions. Non-equilibrium plasmas are currently explored for their capability to activate very stable molecules (such as methane and carbon dioxide) and initiate a series of reactions involving highly reactive species (e.g., radicals and ions) eventually leading to the desired products. ![]() The reactivity of CO 2 + with CD 4 has been experimentally investigated for its relevance in the chemistry of plasmas used for the conversion of CO 2 in carbon-neutral fuels. 5Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czechia.Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Prague, Czechia 3Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin-BP 48, Gif-sur-Yvette, France.Paris-Sud and Paris Saclay, Centre Universitaire Paris-Sud, Orsay, France 1Department of Physics, University of Trento, Trento, Italy.Daniela Ascenzi 1 *, Claire Romanzin 2,3, Allan Lopes 2, Paolo Tosi 1, Jan Žabka 4, Miroslav Polášek 4, Christopher J. ![]()
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