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High frequency longitudinal and transverse dynamics in water | | E. Pontecorvo
; M. Krisch
; A. Cunsolo
; G. Monaco
; A. Mermet
; R. Verbeni
; F. Sette
; G. Ruocco
; | | Date: |
10 Dec 2004 | | Subject: | Disordered Systems and Neural Networks | cond-mat.dis-nn | | Abstract: | High-resolution, inelastic x-ray scattering measurements of the dynamic structure factor S(Q,omega) of liquid water have been performed for wave vectors Q between 4 and 30 nm^-1 in distinctly different thermodynamic conditions (T= 263 - 420 K ; at, or close to, ambient pressure and at P = 2 kbar). In agreement with previous inelastic x-ray and neutron studies, the presence of two inelastic contributions (one dispersing with Q and the other almost non-dispersive) is confirmed. The study of their temperature- and Q-dependence provides strong support for a dynamics of liquid water controlled by the structural relaxation process. A viscoelastic analysis of the Q-dispersing mode, associated with the longitudinal dynamics, reveals that the sound velocity undergoes the complete transition from the adiabatic sound velocity (c_0) (viscous limit) to the infinite frequency sound velocity (c_infinity) (elastic limit). On decreasing Q, as the transition regime is approached from the elastic side, we observe a decrease of the intensity of the second, weakly dispersing feature, which completely disappears when the viscous regime is reached. These findings unambiguously identify the second excitation to be a signature of the transverse dynamics with a longitudinal symmetry component, which becomes visible in the S(Q,omega) as soon as the purely viscous regime is left. | | Source: | arXiv, cond-mat/0501205 | | Services: | Forum | Review | PDF | Favorites | |
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