Proton Migration in Clusters Consisting of Protonated Pyridine Solvated by Water Molecules

Abstract : Proton transfer (PT) from protonated pyridine to water molecules is observed after excitation of microhydrated protonated pyridine (Py) clusters PyH+(H2O)(n) (n=0-5) is induced by a single collision with an Ar atom at high incident velocity (95x10(3)ms(-1)). Besides the fragmentation channel associated with the evaporation of water molecules, the charged-fragment mass spectrum shows competition between the production of the PyH+ ion (or its corresponding charged fragments) and the production of H+(H2O) or H+(H2O)(2) ions. The increase in the production of protonated water fragments as a function of the number of H2O molecules in the parent cluster ion as well sd the observation of a stable H+(H2O)(2) fragment, even in the case of the dissociation of PyH+(H2O)(2), are evidence of the crucial role of PT in the relaxation process, even for a small number of solvating water molecules.
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Submitted on : Tuesday, October 13, 2015 - 11:46:38 AM
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F. Berthias, L. Feketeová, Henry Chermette, Valérian Forquet, Christophe Morell, et al.. Proton Migration in Clusters Consisting of Protonated Pyridine Solvated by Water Molecules. ChemPhysChem, Wiley-VCH Verlag, 2015, 16 (15), pp.3151-3155. ⟨10.1002/cphc.201500465⟩. ⟨in2p3-01214889⟩

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