FLUORESCENCE DECAY MEASUREMENTS VIA HIGH REPETITION RATE GATED PHOTON-COUNTING

Current methods for time-resolved measurements with photon counting detection are not able to take advantage adequately of the high repetition rates available from most pulsed ion laser sources. A technique is described which allows high repetition rate gating of fluorescence decays with photon counting detection. Fluorescence decay measurements of acridine orange ( tau equals 4. 4 ns), rubrene ( tau equals 16. 5 ns) and tris(bipyridine)ruthenium(II) dichloride ( tau equals 760 ns) are obtained at repetition rates as high as 2. 7 MHz. The utility of this technique for analog measurements is also demonstrated.