A viscoelastic analysis of inelastic X-ray scattering spectra from He/Ne mixtures

Abstract

A generalization of the viscoelastic model to binary systems has been applied to analyze inelastic X-ray scattering spectra from a He_0.8Ne_0.2 mixture. Experiments have been carried out at temperature T = 82 K and number density n = 18.5 nm⁻³. In order to test the reliability of such a generalization, we measured a few representative spectra. The model exhaustively describes the experimental data and provides a determination of the spectral densities of the separate mixture components as well as those of both density and concentration fluctuations. These results can be considered as a first test for further developments.

Keywords:

• fluid binary mixtures
• viscoelastic model
• inelastic X-ray scattering

Acknowledgements

We would like to thank R. Cucini, F. D'Amico and R. Verbeni.