The temperature dependence of co-operative modes of motion in liquid lead has been observed in the range 336-725 °c, using the inelastic scattering of cold neutrons. The positions and widths of modes near a frequency of 12·5 × 10 12 rad s -1 do not change significantly with temperature. However, the width of the non-propagating mode at Q = 2·2 Å -1 increases with temperature in a manner suggestive of single-particle motion. Simple models are employed to discuss these processes, although further theoretical work is needed to explain the data fully.
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Wígnall et al. (1968) studied this question.
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