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Doppler-Free Spectrum of the Barium 1S01P1 Transition by Degenerate Four-Wave Mixing Using an Air/Acetylene Flame

Volume 45, Number 4 (May 1991) Page 697-700

Andrews, John M.; Weed, Kenneth M.; Tong, William G.

Doppler-free flame spectrometry based on resonant degenerate four-wave mixing (D4WM) is shown to be an effective analytical tool for the determination of barium at high spectral resolution. Optical phase conjugation is produced in an air/acetylene flame, resulting in an optical signal that is a coherent time-reversed replica of the probe beam. The degenerate four-wave mixing spectrum of barium for the 6s2 1S0-6s6p 1P1 transition at 18,060.19 cm−1 is collected with a linewidth of 0.08 cm−1 (FWHM) with the use of a convenient continuously flowing atmospheric-pressure flame atomizer. A preliminary detection limit of 5 μg/mL barium, while a Doppler-free linewidth is maintained at 0.08 cm−1, is reported.