Pump-probe experiments measured lifetimes. The pump pulse from the OPG laser system was tuned to a resonant transition. The probe pulse, at 213 nm, was mechanically delayed up to 1.8 ns in time, relative to the OPG pulse. With ~30 ps pulse widths for both the pump and probe pulses, this allowed probing of dynamics in the ps regime. Alternatively, we conducted pump-probe mesurements using the OPG laser system for the pump and the excimer laser at 193 nm as the probe pulse, which was delayed electronically, allowing for much longer delays. Due to the 8 ns pulse width of the 193 nm pulses, this arrangement was blind to < 1 ns dynamics. Probing with 213 or 193 nm served as complementary techniques allowing us to observe both fast and slow dynamics.