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Figure 4
Dispersion relations of longitudinal acoustic excitations in Rb-IV at 17.3 GPa. The reduced wavevector q (parallel to the chains) refers to the reciprocal lattice of the host. The two branches are attributed to lattice excitations of the host (solid symbols) and the guest (open symbols), respectively. The inset shows the structure of Rb-IV. (Adapted from Loa et al., 2007BB19.)

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