Some articles on ghz:
Liquid - Microscopic Properties - Sound Dispersion and Structural Relaxation
... In normal liquids, most of this cross over takes place at frequencies between GHz and THz, sometimes called hypersound ... At sub-GHz frequencies, a normal liquid cannot sustain shear waves the zero-frequency limit of the shear modulus is ... after an external perturbation for this reason, the dispersion step in the GHz..THz region is also called structural relaxation ...
... In normal liquids, most of this cross over takes place at frequencies between GHz and THz, sometimes called hypersound ... At sub-GHz frequencies, a normal liquid cannot sustain shear waves the zero-frequency limit of the shear modulus is ... after an external perturbation for this reason, the dispersion step in the GHz..THz region is also called structural relaxation ...
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