Table of Contents
Physics Research International
Volume 2010 (2010), Article ID 749293, 6 pages
http://dx.doi.org/10.1155/2010/749293
Review Article

Energy of the Conduction Band in Near Critical Point Fluids

1Department of Chemistry and Biochemistry, Queens College-CUNY, Flushing, NY 11367, USA
2Department of Chemistry, Graduate Center-CUNY, New York, NY 10016, USA
3Department of Chemistry, University of Louisiana at Monroe, Monroe, LA 71209, USA

Received 6 September 2010; Accepted 6 December 2010

Academic Editor: Anand Pathak

Copyright © 2010 C. M. Evans and G. L. Findley. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The study of the evolution of the conduction band in dense gases and supercritical fluids near the critical point has been complicated by a lack of precise experimental measurements. Both photoemission from an electrode immersed in the fluid and field ionization of a molecule doped into the fluid have been used to probe solvent density effects on the energy of an excess electron as a function of fluid number density and temperature. In this perspective, we present recent experimental results that show a strong critical point effect on the minimum conduction band energy near the critical density and temperature of a fluid. We also discuss the recent development of a new theoretical model that advances our understanding of the density and temperature dependence of the conduction band minimum in near critical point fluids.