Abstract

The combination of a megahertz repetition rate, picosecond dye laser and gated photon counting detection is used to obtain sodium atom fluorescence lifetimes in seeded atmospheric pressure CH₄/O₂/diluent flames. Data acquisition times as short as 1 ms (on-the-fly) are demonstrated with a 3.8-MHz laser rep rate. The area under the fluorescence temporal profiles following laser excitation divided by the fluorescence lifetime is shown to provide a measure of sodium concentration independent of quenching environment.

© 1989 Optical Society of America

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