The structure factor of expanded liquid rubidium at long wavelengths

Abstract
The observed structure factors of expanded liquid rubidium (for temperatures up to 1900K and pressures up to 122 bar near saturation conditions) can be explained using (a) nearly-free electron theory to describe the interatomic forces and then (b) standard techniques of classical liquid theory to deduce the corresponding structures. The high-K observations correspond to close binary collisions involving atomic cores of fairly hard-sphere character, while the low-K behaviour can be described by long-wavelength density fluctuations, the description of which requires, in addition, the use of the interatomic potential tails.

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