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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 minimumconduction 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 minimumin near critical point fluids.


This article was originally published in Physics Research International, available at doi:10.1155/2010/749293.

This is an open access article distributed under the Creative Commons Attribution License.

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