Temperature-dependent photoabsorption cross section measurements of O2 at the OI-1304 Å triplet emission lines

Abstract We report the first temperature-dependent measurements (at 295, 373, 473, and 573 K) of the O 2 photoabsorption cross sections at the aeronomically-important OI-1304 A triplet emission lines. A high current, low voltage argon mini-arc source was used as the light source. The measurements were carried out at a spectral resolution of 0.5 A at full-width-at-ahlf-maximum (FWHM). Direct application of the Beer-Lambert absorption equation yielded the absolute photoabsorption cross sections for O 2 at each line of the OI triplet.