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Picosecond time-resolved four-wave mixing experiments in sodium-seeded flames

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Abstract

Picosecond four-wave mixing experiments have been used to study collisions in a Na-seeded, premixed, methane–air flame. Population gratings are used to measure Na excited-state quenching collision rates, while polarization gratings are used to measure Na ground-state hyperfine coherence randomizing collision rates and overall Na diffusion rates, even though these processes are slower than the excited-state quenching rate.

© 1991 Optical Society of America

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