The p, V, T behaviour of single gases

Interaction-induced spectra of CO2

“…At 225 K, close to the triple point, a low frequency feature begins to separate out, but at no statepoint are the spectra suggestive of a clear timescale separation between reorientational and intermolecular motion. This conclusion has been reached by other experimental groups [12][13][14][15] (usually for room temperature spectra) and is in accord with the results of computer simulations of CO 2 [16,17].…”

“…The depolarized Rayleigh wing spectra of CO 2 have been observed by several groups [12][13][14][15]. The Rayleigh wing is partially due to ' allowed' scattering caused by fluctuations in the molecular orientation density of the fluid but there is also an intermolecular component due to the dipole-induced dipole mechanism, for which the induced moment is given by…”

Properties of liquid CS2from the allowed light scattering spectra

“…The hydrodynamic prediction for the width of the collision induced spectra is a variation like 0T/T) -1 [2] which can be combined with the measured temperature dependence of the integrated intensity to give a predicted peak height variation of T~/ (in line with the hydrodynamic prediction for rv-1). However the observed halfwidths vary slightly more slowly that r/-1 giving the peak height behaviour shown in figure 6.…”

“…The association should be made between the peak height of the collision induced spectrum and the isotropic linewidth since the former is determined by the zero frequency spectral density of the density fluctuations, as is the dephasing time. The most appropriate collision induced spectra with which to compare are the induced Raman lines since these, like the dephasing process, reflect two and three particle correlation functions [2]. In figure 6 we show the peak height of the II,, Raman spectrum, this is also normalized to the 165 K value of rv -1.…”

“…An interesting molecule for which a simulation with a reasonably realistic potential could be compared with extensive data on the liquid state is CS v The light scattering spectroscopy of this liquid is a potentially rich source of information because of its ideal symmetry, large liquid range, closely related analogues OCS and CO~ and because its highly polarizable nature makes accessible a wide variety of collision induced phenomena [2]. As we shall show below the dynamical properties of the CS 2 molecule show many characteristics which may be regarded as typical for an organic liquid.…”