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We report neutron-scattering measurements of the coherent scattering function S (Q, ) of liquid rubidium at 315 K, in the range of wave vectors 1. 255. 5 ^-1. In this range there is no evidence of peaks at finite in S (Q, ) plotted at constant Q. On the other hand the Fourier transform F (Q, t) exhibits structure, notably for Q=2. 0 ^-1, which indicates at least two characteristic (wavelength-dependent) relaxation times in the liquid. For wave vectors >3. 0 ^-1, F (Q, t) may be characterized by a single relaxation time. These results, in conjunction with our results for Q<1. 0 ^-1, offer the possibility of detailed comparisons with models of the liquid state and with molecular-dynamics calculations.
Copley et al. (Mon,) studied this question.