Pressure dependence of the 2.3 μm laser-induced fluorescence (LIF) of room temperature PuF6

When PuF6 is excited in the 800 nm region, fluorescence peaked at 2.296 μm with less intense peaks at 2.207 and 2.126 μm is observed. Unlike the previous works that reported no self-quenching of the 2.3 μm LIF of PuF6, our data indicate a pressure dependence for the 2.3 μm LIF lifetime with a self-quenching rate constant of 162 +- 4 Torr-1 s-1 and a collision-free lifetime of 218 +- 5 μs. Both fluorescence and excitation spectra are in good agreement with the previously reported absorption spectrum of PuF6