Abstract
We have investigated the temperature dependence of the dynamical structure, in particular the dispersion relation of the collective excitation, of expanded liquid rubidium on the basis of the effective pair potential derived by the pseudopotential theory, the static structure factor calculated in the modified hypernetted-chain (MHNC) approximation and the dynamical structure factor in the viscoelastic approximation. The characteristic features of the observed temperature dependence of the dispersion relation are well reproduced theoretically.
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