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

摘要: Dynamics of supercritical water was studied by quasi-elastic neutron scattering. Two series measurements, respectively, at constant temperature 673 K and density 0.578 g/cm 3 were carried out. Experimental data fitted properly the jump-diffusion model. The self-diffusion coefficient, typically in interval 3.71–5.21 � 10 8 m 2 /s, depends both on density. mean residence time is, however, fairly 0.30 ps all cases. From dependence coefficient which is Arrhenius type activation energy Ea ¼ 2:25 kcal/mol being estimated. 2003 Elsevier Science B.V. All rights reserved.