title: No fragile-to-strong crossover in LiCl-H2O solution.
abstract: Dynamics of water, especially in the temperature range of the "no man's land", remain a mystery. We present detailed study of dynamics in aqueous LiCl solution that is often considered as a model for bulk water. We employ broadband dielectric and light scattering spectroscopy in a broad frequency and temperature range. Our analysis reveals no sign of the fragile-to-strong crossover (FSC) neither in structural relaxation nor in translational motions. Our experimental results combined with a large selection of literature data lead to the clear conclusion-there is no FSC in dynamics of aqueous solutions at T ∼ 200-230 K. Instead, our analysis reveals appearance of the so-called excess wing at the high frequency tail of the structural relaxation peak. We discuss the localized nature of the relaxation process that contributes to the excess wing.
authors.affiliation: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nakanishi
authors.forename: Philip
authors.initials: P
authors.lastname: Griffin
authors.forename: Eugene
authors.initials: E
authors.lastname: Mamontov
authors.forename: Alexei P
authors.initials: AP
authors.lastname: Sokolov