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 (τ = 4.4 ns), rubrene (τ = 16.5 ns) and tris(bipyridine)ruthenium(II) dichloride (τ = 760 ns) are obtained at repetition rates as high as 2.7 MHz. The utility of this technique for analog measurements is also demonstrated.
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26.
For example, the AVM-1 pulse generator available from Avtech Electrosystems Ltd, Ottawa, Ontario has 100 ps rise and fall times and provides pulses as short as 200 ps.
27.
The ITT F4129G microchannel plate multiplier phototube is an example of recent developments in such devices.
28.
LytleF. E. and KelseyM. S., Anal. Chem.46, 855 (1974).
