Adkins, Erin M; Yurchenko, Sergei N; Somogyi, Wilfrid; Hodges, Joseph T; (2025) An accurate determination of O2 A-band line intensities through experiment and theory. Journal of Quantitative Spectroscopy and Radiative Transfer , 338 , Article 109412. 10.1016/j.jqsrt.2025.109412.

Text 240221_Oxygen A-Band Intensities.pdf - Accepted Version Access restricted to UCL open access staff until 10 March 2026. Download (958kB)

Abstract

Accurate intensities of the O2 A-band [ b1Σ+ g ←X3Σ− 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 %, and the measured intensities have relative combined standard uncertainties at the 0.15 % level. 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.

Download activity - last month

Export as JSONXMLCSV

Download activity - last 12 months

Export as CSVXMLJSON

Downloads by country - last 12 months

Export as JSONXMLCSV

Archive Staff Only

View Item