Luminescence quenching of UO2(NO3)2·2TBP in supercritical fluid CO2

Abstract

The luminescence quenching of UO₂(NO₃)·2TBP in supercritical fluid (ScF) CO₂ has been examined with time resolved laser induced fluorescence (TRLIF). Quenching mechanisms for the uranyl complex with respect to ScF composition, pressure and temperature have been identified. A description of pressure quenching in ScF has been shown to require both the bimolecular collisional dynamics associated with a gas phase as well as the viscosity effects expected from a liquid phase.