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Time-resolved observation of the Eigen cation in liquid water

Abstract : Experimental observation and time relaxation measurement of the hydrated proton Eigen form [H3 O+ (H2 O)3] are presented here. Vibrational time-resolved spectroscopy is used with an original method of investigating the proton excess in water. The anharmonicity of the time-resolved spectra is characteristic of the Eigen-type proton geometry. Proton relaxation occurs in less than 200 fs. A calculation of the potential energy confirms the experimental result and the Eigen cation lifetime is in good agreement with previous molecular dynamics simulations. Cop. 2007 American Institute of Physics.
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Wafa Amir, Guilhem Gallot, François Hache, S. Bratos, J.-C. Leicknam, et al.. Time-resolved observation of the Eigen cation in liquid water. Journal of Chemical Physics, 2007, 126 (3), pp.34511. ⟨10.1063/1.2428299⟩. ⟨hal-00824061⟩



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