DOI: https://doi.org/10.30970/jps.02.322
SPECTRUM OF COLLECTIVE TRANSVERSE EXCITATIONS IN LIQUID CESIUM NEAR THE MELTING POINT
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Journal of Physical Studies 2(3), 322–330 (1998)
DOI: https://doi.org/10.30970/jps.02.322 SPECTRUM OF COLLECTIVE TRANSVERSE EXCITATIONS IN LIQUID CESIUM NEAR THE MELTING POINT |
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T. Bryk, I. Mryglod
Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine,
1 Svientsitskii Str., Lviv, UA–290011, Ukraine
E–mail: mryglod@icmp.lviv.ua
The spectrum of generalized transverse excitations of liquid cesium at 308 K is calculated within the approach of generalized collective modes. The transverse ‟current–current" time correlation function is obtained in the form which satisfies the first frequency moments up to the sixth order. The crossover from the usual hydrodynamic behavior to the regime, where well–defined shear waves are supported by the liquid, is studied. We found the wavenumber $k_{\sc h}=0.092$~\AA$^{-1}$ at which the shear propagating modes disappear and transform into two relaxing modes, where one of them is the usual hydrodynamic one. The generalized static shear viscosity is calculated in a wide range of wave numbers $k$. In hydrodynamic limit we found good agreement of the calculated generalized shear viscosity with experimental data.