Doppler-Free Spectrum of the Barium 1S0−1P1 Transition by Degenerate Four-Wave Mixing Using an Air/Acetylene Flame
- 1 May 1991
- journal article
- research article
- Published by SAGE Publications in Applied Spectroscopy
- Vol. 45 (4) , 697-700
- https://doi.org/10.1366/0003702914336958
Abstract
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 6 s21 S0-6 s6 p1 P1 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.Keywords
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