Generalized collective excitations in supercritical argon

Abstract

Dispersion and damping of collective excitations in supercritical argon along the isothermal line of 280 K are studied by a combination of molecular dynamics simulations and Generalized Collective Mode (GCM) analysis. ‘Positive dispersion’ of collective excitations and its dependence on density is discussed on the basis of GCM theory of ‘positive dispersion’.

Keywords:

• supercritical fluids
• collective excitations
• dispersion law
• molecular dynamics
• generalized collective modes
• structural relaxation

Acknowledgements

TB was partially supported by the project PHA-0107U002081.