Mean Free Path and Ultrasonic Vibrational Relaxation in Liquids and Dense Gases

Nuclear spin relaxation in liquids and gases

The aim of this report is to cover the progress of work in the field of magnetic relaxation and self-diffusion in liquids and gases over a period of twelve months from June 2005 to May 2006, and is a continuation of the report given last year. As in previous periods, this review is limited to work on comparatively simple liquids and solutions of physico-chemical and chemical interest, as public...

Vibrational and Rotational Energy Relaxation in Liquids

Vibrational and rotational energy relaxation in liquids are studied by means of computer simulations. As a precursor for studying vibrational energy relaxation of a solute molecule subsequent to the formation of a chemical bond, the validity of the classical Bersohn-Zewail model for describing the intramolecular dynamics during photodissociation is investigated. The apparent agreement with quan...

On the Theory of Vibrational Relaxation in Gases

Structural relaxation in dense liquids composed of anisotropic particles.

We perform extensive molecular dynamics simulations of dense liquids composed of bidisperse dimer- and ellipse-shaped particles in two dimensions that interact via purely repulsive contact forces. We measure the structural relaxation times obtained from the long-time α decay of the self part of the intermediate scattering function for the translational and rotational degrees of freedom (DOF) as...

Classical Gases and Liquids

Because there are only a few problems in statistical mechanics that can be solved exactly, we need to find approximate solutions. We introduce several perturbation methods that are applicable when there is a small expansion parameter. Our discussion of interacting classical particle systems will involve some of the same considerations and difficulties that are encountered in quantum field theor...