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Published June 16, 2010 | Published
Journal Article Open

Cavity ring-down spectroscopy measurements of sub-Doppler hyperfine structure


Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was used to measure magnetic dipole transitions in the b^1Σ_g^+ ← X^3Σ_g^-(0,0) band of O_2. The ^(17)O-containing isotopologues show unresolved hyperfine structure due to magnetic hyperfine splitting in the ground state. The sensitivity and stability of FS-CRDS allow for quantitative sub-Doppler measurements of the hyperfine constants, even when the hyperfine splittings are much smaller than the Doppler width. Unlike saturation spectroscopy, this linear absorption technique can be applied to weak transitions and employed to quantitatively measure intensities and line shapes. This method may be an attractive approach for measuring unresolved hyperfine structure in excited electronic states.

Additional Information

© 2010 APS. Received 23 March 2010; published 16 June 2010. D. A. Long was supported by the National Science Foundation and Department of Defense. D. K. Havey acknowledges the support of the National Research Council as a postdoctoral fellow at NIST, Gaithersburg, MD. Part of the research described in this report was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA). Additional support was provided by the Orbiting Carbon Observatory (OCO) project, a NASA Earth System Science Pathfinder (ESSP) mission, and the NASA Upper Atmospheric Research Program Grants NNG06GD88G and NNX09AE21G.

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