Abstract
A study of collective excitations in liquid selenium has been done in terms of longitudinal and transverse phonon eigen-frequencies using two different routes, i.e., the theory of liquids as developed by Hubbard and Beeby and the theory of phonons in amorphous solids using a self-consistent method. Rao-Joarder's equation has been used to compute the interaction potential by employing neutron diffraction results of the structure factor. A good qualitative agreement is observed between dispersion curves obtained from these routes and the recently reported experimental and molecular dynamics results. Further, from the low wave-vector transfer region of the dispersion curves, longitudinal and transverse sound velocities are evaluated. Finally, some thermodynamical properties, viz., isothermal compressibility, adiabatic compressibility, Debye temperature and specific heat at constant pressure and volume are also calculated. The calculated results of these elastic and thermal properties are in good agreement with the available data.
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