A study of the nearly thermoneutral reactions of N+ with H2, HD and D2 |
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| Affiliation: | 1. National Research Center “Kurchatov Institute” - Petersburg Nuclear Physics Institute, Orlova Roscha. 1, 188300 Gatchina, Russia;2. Department of Chemistry, M. Lomonosov Moscow State University, Vorob’evy gory 1/3, Moscow 119991, Russia;3. School of Chemistry, Tel Aviv University, 69978 Tel Aviv, Israel;4. Laboratory for Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany;5. Massachusetts Institute of Technology, Cambridge, MA, USA;6. Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany |
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| Abstract: | The rate coefficients k for the nearly thermoneutral atom abstraction reactions of N+ ions with H2, HD and D2 have been determined as a function of ion-molecule centre-of-mass energy, KEcm, in a SIFDT apparatus, over the range of KEcm from thermal energy at 300 K to ≈ 0.5 eV. From Arrhenius-type plots of ln k versus (KEcm)−1, values of the thermicities of the reactions, ΔE, have been determined. The differences in the values of ΔE obtained for the reactions are accounted for by differences in the vibrational zero-point energies of the reactant and product molecules. From the data, the absolute proton affinity of the N atom is found to be 3.531 eV. |
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