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Doppler-free laser-induced fluorescence of oxygen atoms in an atmospheric-pressure flame

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Abstract

Doppler-free laser-induced fluorescence of oxygen atoms has been measured in the burnt gases of an atmospheric-pressure flame, where the Doppler and collisional widths are similar. The 3p 3P level was excited using counterpropagating beams at 226 nm. Upper-state fine-structure splitting could be partially resolved, and a collisionally broadened Lorentzian width of 0.42 cm−1 was measured. This corresponds to a broadening cross section of 10−13 cm2, which is larger than that expected for collisional quenching alone.

© 1989 Optical Society of America

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