Time-resolved optical Kerr effect measurements in aqueous ionic solutions

Year: 1994

Authors: Santa I., Foggi P., Righini R., Williams J.H.

Autors Affiliation: European Laboratory for Non-Linear Spectroscopy, University of Florence, Largo E. Fermi, 2 (Arcetri), I-50125 Florence, Italy; Science, Thomas House, George IV Street, Cambridge CB2 1HH, United Kingdom; Department of Physics, Janus Pannonius University, Ifjusag u.6, Pécs, Hungary

Abstract: We report the molecular dynamics of several solvated ions present in aqueous ionic solutions (HCl, HNO3, NaCl, and NaNO3) investigated by femtosecond time-resolved optical Kerr effect measurements. From the accurate fitting of decay curves, measured over 5-6 decades of intensity range, it has been possible to characterize (i) an instantaneous electronic response, (ii) a fast contribution of water, (iii) a rotational relaxation of the individual ions (trot ~ 2-3 ps), and (iv) a slow concentration-dependent decay connected to the direct ion-ion interactions. These results will be of interest to those seeking to measure electro-optic effects in aqueous solutions as these experiments give new information on the nature of the aqueous state.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY

Volume: 98 (31)      Pages from: 7692  to: 7701

KeyWords: Neutron-diffraction; Binary-solutions
DOI: 10.1021/j100082a047

Citations: 22
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