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Dielectric constant of atomic fluids with variable polarizability
B J Alder1, J C Beers, H L Strauss
1Lawrence Livermore Laboratory, P.O. Box 808, Livermore, California 94550.
Summary
This study analyzes dielectric constants by expanding the Clausius-Mossotti function. It empirically determines trace contributions to pair polarizabilities, showing good agreement for helium and qualitative agreement for argon.
Area of Science:
- Atomic and Molecular Physics
- Condensed Matter Physics
- Physical Chemistry
Background:
- The Clausius-Mossotti function relates dielectric properties to molecular polarizabilities.
- Understanding pair polarizabilities is crucial for accurate dielectric constant modeling.
- Previous work focused on anisotropic pair polarizabilities from light scattering.
Purpose of the Study:
- To expand the Clausius-Mossotti function using single atom and pair polarizabilities.
- To empirically determine the trace contribution to pair polarizabilities.
- To compare experimental results with electronic structure calculations for noble gases.
Main Methods:
- Expansion of the Clausius-Mossotti function.
- Empirical determination of trace contributions via dielectric experiments.
- Analysis of anisotropic pair polarizabilities from light scattering data.
Main Results:
- Contributions to the dielectric constant depend on both trace and anisotropy of pair polarizabilities.
- Empirical determination of the trace contribution is achieved through dielectric measurements.
- Good agreement between experimental and calculated short-range trace parts for helium was observed.
- Qualitative agreement was found for argon.
Conclusions:
- The study successfully determined the trace contribution to pair polarizabilities.
- The findings validate the theoretical framework for noble gases.
- This work provides a foundation for more accurate dielectric property predictions.