An Accurate Determination of O2 A-band Line Intensities through Experiment and Theory

Published

February 27, 2025

Author(s)

Erin Adkins, Sergei Yurchenko, Wilfrid Somogyi, Joseph Hodges

Abstract

Accurate intensities of the O2 A-band 〖[b〗^1 Σ_g^+⟵X^3 Σ_g^- (0,0)] centered about 760 nm are essential to reduce biases in satellite- and ground-based remote measurements of column-integrated air mass and greenhouse gas concentration. In support of these remote sensing techniques, we made cavity ring-down spectroscopy measurements of 16O2 A-band line intensities up to J = 40, and we extrapolated these values to J = 60 using scaled ab initio intensity calculations. The J dependences of the measured and theoretical intensities differ on average by less than 0.1 %. The measured intensities have relative combined standard uncertainties at the 0.15 %. Upon evaluation of the integrated intensity, we find a negative bias between literature results and this work, which is four times greater than our present uncertainty.

Citation

Journal of Quantitative Spectroscopy and Radiative Transfer

Volume

338

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.jqsrt.2025.109412

Local Download

Keywords

line intensities, remote sensing

Citation

Adkins, E. , Yurchenko, S. , Somogyi, W. and Hodges, J. (2025), An Accurate Determination of O2 A-band Line Intensities through Experiment and Theory, Journal of Quantitative Spectroscopy and Radiative Transfer, [online], https://doi.org/10.1016/j.jqsrt.2025.109412, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959253 (Accessed October 20, 2025)