Figure 2. Close-up of the first part of the wave-packet – particle interaction shown in Figure 1a, during which the phonon transfers energy and momentum to the liquid particle. wp is the extension of the wave-packet, and pd that of the liquid particle. Once p has elapsed and the liquid particle has travelled by p , the particle relaxes the energy stored into internal DoF; then it travels by R during R (not shown in the figure above).
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