Acoustic Phonon Dynamics in Liquid CCl<sub>4</sub>

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  • Acoustic Phonon Dynamics in Liquid CCl4

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The dynamic scattering factor S(Q,ω) was measured by high-resolution inelastic X-ray scattering using intense X-rays from a third-generation synchrotron radiation facility. The observed spectra demonstrate the existence of longitudinal propagating modes at small Q values, although the collective excitations are highly damped (not overdamped) as in the classical van der Waals liquid Ar. The Q–ω relation of the excitation shows a positive dispersion of about 37%, much larger than in liquid metals but similar to that in liquid Ar. The collective dynamics of liquid CCl4 at small Q values can be interpreted in the framework of classical dense liquids.

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