Does exist an anomalous sound dispersion in supercooled water?

Andrea Taschin (1) , Riccardo Cucini (2) , Paolo Bartolini (1) , Renato Torre (3)

1 UniFI - Università degli Studi di Firenze = University of Florence = Université de Florence
2 ELETTRA
3 Dipartimento di Fisica

Acoustic sound velocity of water in the supercooled regime shows a peculiar behaviour. Accordingly to the available data, sound velocity displays a complex behaviour below $-15$ $^\circ$C, here anomalous frequency dispersion phenomena seem to appear and need to be understood. In particular lower frequencies data at a few tens of KHz show leveling-off of the sound velocity value below -25 $^\circ$C, with a possible minimum around -30 $^\circ$C. Other data at higher frequencies, around 1 GHz, in comparison with the low frequency data, could instead suggest the existence of a "negative dispersion", yet other high frequency data show a normal dispersion behaviour. To get new insight into this topic, we made measurements of acoustic sound velocity in bulk water in the liquid and supercooled phase down to -29 $^\circ$C by means of a heterodyne detected transient grating (TG) experiment at an unexplored frequency value around 100 MHz.

Mots clés: Physical Sciences

Andrea Taschin, Riccardo Cucini, Paolo Bartolini, Renato Torre. Does exist an anomalous sound dispersion in supercooled water?. Philosophical Magazine, 2010, pp.1. ⟨10.1080/14786435.2010.522215⟩. ⟨hal-00637021⟩