Density fluctuation spectra in Ar36 fluid having number density 21, 5 and 2 nm−3

Abstract Making use of the recently proposed modified microscopic theory by the authors, it has been possible to explain quantitatively the observed dynamics of a Van der Waals fluid, Ar36 when the number density of Ar atoms varies from 2, 5 to 21 particles/nm3 in the momentum transfer region extending to almost two orders of magnitude in the wave vector from the Rayleigh regime.