A quasi-elastic neutron scattering study of the dynamics of supercritical water

Dynamics of supercritical water was studied by quasi-elastic neutron scattering. Two series of measurements, respectively, at constant temperature of 673 K and constant density of 0.578 g/cm 3 were carried out. Experimental data were fitted properly by the jump-diffusion model. The self-diffusion co...

Full description

Saved in:
Bibliographic Details
Published in:Chemical physics 2003-08, Vol.292 (2), p.229-234
Main Authors: Beta, I.A., Li, J.-C., Bellissent-Funel, M.-C.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Dynamics of supercritical water was studied by quasi-elastic neutron scattering. Two series of measurements, respectively, at constant temperature of 673 K and constant density of 0.578 g/cm 3 were carried out. Experimental data were fitted properly by the jump-diffusion model. The self-diffusion coefficient, typically in the interval 3.71–5.21 × 10 −8 m 2/s, depends both on temperature and density. The mean residence time is, however, fairly constant at 0.30 ps in all cases. From the temperature dependence of self-diffusion coefficient which is of Arrhenius type the activation energy E a=2.25 kcal/mol is being estimated.
ISSN:0301-0104
DOI:10.1016/S0301-0104(03)00228-3