DOI: https://doi.org/10.30970/jps.08.35
GENERALIZED COLLECTIVE MODES IN LIQUID CESIUM
T. Bryk, I. Mryglod
Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine
1 Svientsitskii St., Lviv, UA-79011, Ukraine
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Journal of Physical Studies 8(1), 35–46 (2004)
DOI: https://doi.org/10.30970/jps.08.35 GENERALIZED COLLECTIVE MODES IN LIQUID CESIUMT. Bryk, I. Mryglod
Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine |
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The spectrum of collective excitations of liquid Cs at 308 K is investigated within the nine-variable approximation of generalized collective mode approach. An original analysis of spectra is performed to establish the physical meaning as well as the origin of all the propagating and relaxing collective modes found. Two branches of low- and high-frequency propagating excitations are identified with the heat waves. It is shown that a kinetic relaxing mode, caused by density fluctuations, defines almost completely the shape of `density-density' time correlation function for wavenumbers close to the main peak position of the static structure factor. Amplitudes of mode contributions to the `density-density' and `heat density-heat density' time correlation functions are studied in detail.
PACS number(s): 05.20.Jj, 61.20.Ja, 66.10.Cb