A molecular-dynamics study of the temperature dependence of the dynamic structure factor for liquid rubidium was made in order to clarify the role of density fluctuations in determining the stability limit of the supercooled liquid. Neutron scattering measurements on supercooled liquid gallium and on supercooled mixtures of lead and tin have led to conflicting interpretations of the temperature variation of the dynamic structure factor. The molecular-dynamics results for supercooled liquid rubidium indicate that the temperature variation of the dynamic structure factor correlates with the self-diffusion coefficient. By reexamining the data for liquid gallium we show that the experimental and the molecular-dynamics results can be given a common interpretation and that the density fluctuations are not an indicator of the limit of stability of a supercooled liquid.
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Mountain et al. (1983) studied this question.
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