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Structural and collisional relaxations in liquids and supercritical fluids | | F Bencivenga
; A Cunsolo
; M Krisch
; G Monaco
; L Orsingher
; G Ruocco
; F Sette
; A Vispa
; | | Date: |
23 Feb 2007 | | Journal: | Phys Rev Lett, 98 (8), 085501 | | 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. | | Source: | PubMed, pmid17359108 | | Services: | Forum | Review | Favorites | |
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