The dynamic structure factor S(Q,omega) of both associated (water and ammonia) and simple fluids (nitrogen and neon) has been determined by high-resolution inelastic x-ray scattering in the 2-14 nm(-1) momentum transfer range. A line-shape analysis with a generalized hydrodynamic model was used to study the involved relaxation process and to characterize its strength and time scale. We observe that in the liquid phase such a process is governed by rearrangements of intermolecular bonds, whereas in the supercritical region it assumes a collisional nature.
Structural and collisional relaxations in liquids and supercritical fluids / F., Bencivenga; A., Cunsolo; M., Krisch; G., Monaco; L., Orsingher; Ruocco, Giancarlo; F., Sette; A., Vispa. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 98:8(2007), pp. 085501-085501. [10.1103/physrevlett.98.085501]
Structural and collisional relaxations in liquids and supercritical fluids
RUOCCO, Giancarlo;
2007
Abstract
The dynamic structure factor S(Q,omega) of both associated (water and ammonia) and simple fluids (nitrogen and neon) has been determined by high-resolution inelastic x-ray scattering in the 2-14 nm(-1) momentum transfer range. A line-shape analysis with a generalized hydrodynamic model was used to study the involved relaxation process and to characterize its strength and time scale. We observe that in the liquid phase such a process is governed by rearrangements of intermolecular bonds, whereas in the supercritical region it assumes a collisional nature.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
