Critical density effect on the vibrational dephasing in pure methane
- 20 February 1987
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 60 (3), 605-615
- https://doi.org/10.1080/00268978700100401
Abstract
The Raman isotropic v 1 band of methane has been studied along numerous isochoric lines, in a density range 0·2ρc < ρ < 2·5ρc, and over a wide range of temperature 2 . 10-3 < (T - T c)/T c < 5 . 10-1. A critical density broadening is observed even very far from the critical temperature. This effect is related in a large measure to an enhancement of the frequency modulation correlation time, an order of magnitude of which can be obtained from the band profile.Keywords
This publication has 22 references indexed in Scilit:
- Determination of the modulation regime for vibrational dephasing. Demonstration on the critical Raman broadening in nitrogenChemical Physics Letters, 1986
- High resolution Raman spectra of near-critical CO2The Journal of Chemical Physics, 1985
- Vibrational Raman Effect: A New Experimental Probe of the Liquid-Vapor Critical PhenomenonPhysical Review Letters, 1984
- Vibrational phase relaxation in ethane at moderate densities, including the critical regionThe Journal of Chemical Physics, 1983
- Universality in the Critical Broadening of Spectral Lines in Simple FluidsPhysical Review Letters, 1983
- Pure vibrational Raman spectra of simple liquids: O2, N2, CO, CH4, CF4The Journal of Chemical Physics, 1980
- Rayleigh and Raman scattering near the critical point of carbon dioxideThe Journal of Chemical Physics, 1980
- The critical contribution to vibrational dephasingMolecular Physics, 1979
- Anomalous Behavior in the Vibrational Raman Spectrum of Oxygen under Near-Critical ConditionsPhysical Review Letters, 1978
- Temperature dependence of the width of the Raman Q branch in liquids nitrogen and oxygenThe Journal of Chemical Physics, 1977