Computer simulation study of Rayleigh and Raman spectra and spectral moments of fluid C2H6

Depolarized Rayleigh and Raman scattering from fluids is composed of orientational (OR), collision induced (CI), and cross (X) contributions. In order to investigate the influence of the interaction induced terms (CI and X) on allowed spectra (OR), C2H6, a molecule with a small ratio of the anisotropic part γ to the isotropic part α of the polarizability is considered. Both Rayleigh and ν3 Raman correlation functions were determined by molecular dynamics (MD) computer simulation and compared with experiment. The investigations extend over a wide range of densities (0.67ρc–2.85ρc, where ρc is the critical density, ρc=0.206 g/cm3). The different contributions to the time correlation functions (TCFs) were simulated within the frame of a first‐order center–center dipole–induced‐dipole polarizability model. The potential model used was a standard two‐site Lennard‐Jones potential. Details concerning partial OR, CI, and X correlation functions and second moments for Rayleigh and Raman scattering are presented. A...

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