Relaxation dynamics of water and HCl aqueous solutions measured by time-resolved optical kerr effect

Year: 1997

Authors: Foggi P., Bellini M., Kien D.P., Vercuque I., Righini R.

Autors Affiliation: LENS, University of Florence, L.go E. Fermi 2, 50125 Florence, Italy; Department of Chemistry, University of Florence, Via G. Capponi 9, 50121 Florence, Italy; LASIR, CNRS UPR A2631L, University Sci. et Techn. de Lille, 59655, Villeneuve d\’Ascq, France; Department of Chemistry, University of Basilicata, Via N. Sauro 85, 85100 Potenza, Italy

Abstract: Fast relaxation processes in water and HCl-water solutions are measured by time-resolved heterodyne detected optical kerr effect. The decay of the signal, observed after 500 fs, is well fitted by a biexponential. The temperature dependence of the two decay time constants and the relative weights of the two exponentials, for water and for samples of different HCl concentration, are consistent with a picture in which the hydrogen bonds dominate the dynamics and the optical response of the system: the fast decay time is closely related to the mean lifetime of individual H bonds, while the slow time constant is attributed to collective relaxation of structured regions of the liquid.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY A

Volume: 101 (38)      Pages from: 7029  to: 7035

KeyWords: Heterodyning; Hydrochloric acid; Hydrogen bonds; Optical Kerr effect; Relaxation processes; Solutions; Temperature; Water, Relaxation dynamics; Time resolved optical kerr effect, Molecular dynamics
DOI: 10.1021/jp962760v

Citations: 40
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