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Published September 2010 | public
Journal Article

O_2 A-band line parameters to support atmospheric remote sensing


Numerous satellite and ground-based remote sensing measurements rely on the ability to calculate O_2 A-band [b^1Σ_g^+←X^3Σ_g^−(0,0)] spectra from line parameters, with combined relative uncertainties below 0.5% required for the most demanding applications. In this work, we combine new ^(16)O_2 A-band R-branch measurements with our previous P-branch observations, both of which are based upon frequency-stabilized cavity ring-down spectroscopy. The combined set of data spans angular momentum quantum number, J′ up to 46. For these measurements, we quantify a J-dependent quadratic deviation from a standard model of the rotational distribution of the line intensities. We provide calculated transition wave numbers, and intensities for J′ up to 60. The calculated line intensities are derived from a weighted fit of the generalized model to an ensemble of data and agree with our measured values to within 0.1% on average, with a relative standard deviation of ≈0.3%. We identify an error in the calculated frequency dependence of the O_2 A-band line intensities in existing spectroscopic databases. Other reported lineshape parameters include a revised set of ground-state energies, self- and air-pressure-broadening coefficients and self- and air-Dicke-narrowing coefficients. We also report a band-integrated intensity at 296 K of 2.231(7)×10^(−22) cm molec^(−1) and Einstein-A coefficient of 0.0869(3) s^(−1).

Additional Information

© 2010 Published by Elsevier B.V. Received 19 March 2010; revised 5 May 2010; accepted 9 May 2010. Available online 13 May 2010. We thank Piotr Maslowski of Nicolaus Copernicus University in Toruń, Poland for useful discussions regarding line shape analysis. David A. Long was supported by the National Defense Science and Engineering Graduate Fellowship. We acknowledge the National Research Council for awarding Daniel Havey a postdoctoral fellowship at the National Institute of Standards and Technology (NIST), Gaithersburg, MD. Part of the research described in this paper 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; the NASA Upper Atmospheric Research Program grant NNG06GD88G and NNX09AE21G; and the NIST Office of Microelectronics Programs.

Additional details

August 19, 2023
October 20, 2023