Status and Future Developments in the Study of Transport Properties

This volume contains the fourteen papers presented at the NATO-sponsored Ad vanced Research Workshop on the 'Status and Future Developments in the Study of Transport Properties' held in Porto Carras, Halkidiki, Greece from May 29 to May 31, 1991. The Workshop was organised to provide a forum for the discussion among prac titioners of the state-of-the-art in the treatment of the macroscopic, non-equilibrium properties of gases. The macroscopic quantities considered all arise as a result of the pairwise interactions of molecules in states perturbed from an equilibrium, Maxwellian distribution. The non-equilibrium properties of gases have been studied in detail for well over a century following the formulation of the Boltzmann equation in 1872. Since then the range of phenomena amenable to experimental study has expanded greatly from the properties characteristic of a bulk, non-uniform gas, such as the viscosity and thermal conductivity, to the study of differential scattering cross-sections in molecular beams at thermal energies, to studies of spectral-line widths of individual molecules and of Van der Waals complexes and even further. The common thread linking all of these studies is found in the corresponding theory which relates them all to the potential energy function describing the interaction of pairs of molecules. Thus, accompanying the experimental development there has been a corresponding improvement in the theoretical formulation of the quantities characterising the various phenomena.

Texte du rabat

The book contains authoritative review articles by the world's leading experts on non-equilibrium processes in gases which are pertinent to the study of the forces between molecules. The reviews therefore encompass both theoretical and experimental studies of the bulk properties of gases, such as the viscosity and thermal conductivity and ion mobility, with particular reference to the effects of electric and magnetic fields. The text also contains a summary of the current state of the theoretical treatment of the forces between molecules, together with the experimental study of these forces by means of molecular beam scattering and various kinds of molecular spectroscopy. The molecular systems discussed are all polyatomic and there is particular emphasis on the anisotropy of the intermolecular potential and its effects. The volume is unique in that it brings together a number of strands of current attempts to elucidate the forces between molecular systems.

Contenu
Overview on Intermolecular Potentials.- Traditional Transport Properties.- Classical Path Methods for Lineshape Cross Sections.- Crossed Beam Studies.- Status of Kinetic Theory.- Overview on Experimental Data from SenftlebenBeenakker Effects and Depolarized Rayleigh Scattering.- Elastic and Inelastic Cross-Sections from Laser Studies of Small Molecules.- Atomic Ion/Molecular Systems.- Classical and Semiclassical Treatment of Energy Transfer in Small Molecules.- Generalized Cross-Sections for SenftlebenBeenakker Effects and Laser Studies of Molecules.- From Line-Broadening to Van der Waals Molecules: Complementary Ways to Probe the Anisotropic Interaction.- Calculation of Pressure Broadened Spectral Line Shapes Including Collisional Transfer of Intensity.- Concluding Remarks.- List of Participants.