State-dependent solvation of pyrene in supercritical CO2

Experiments were performed to characterize solute-fluid and solute-solute interactions in dilute supercritical solutions. The experiments were carried out using the fluorescence probe pyrene. Results indicate that the excimer-like emission from pyrene is not due to soluble pyrene aggregates or dissolved ground-state pyrene species by are caused by the pyrene molecules' tendency to solvate individually.