Time-resolved observation of the Eigen cation in liquid water
Résumé
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.
Domaines
Chimie-Physique [physics.chem-ph]
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