Abstract

Using molecular dynamics simulation, we show that the vibrational relaxation lifetime of a diatomic in a two-dimensional supercritical rare-gas fluid exhibits the same unexpected plateau behavior as was observed experimentally for W(CO)6 in supercritical CO2 by Fayer and co-workers, and we link this behavior to average local solvent density enhancements arising from the solvent’s near-critical density fluctuations.

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