Line-shape parameters and line mixing for the low-intensity high-J oxygen transitions

• Published in: Journal of physics. Conference series 2023-01, Vol.2439 (1), p.12018
• Main Authors: Domysławska, Jolanta, Wójtewicz, Szymon, Bielska, Katarzyna, Masłowski, Piotr, Cygan, Agata, Słowiński, Michał, Bilicki, Sławomir, Trawiński, Ryszard S, Ciuryło, Roman, Lisak, Daniel
• Format: Article
• Language: English
• Subjects: Angular momentum; Line shape; Low pressure; Mathematical analysis; Oxygen; Parameters; Physics; Shape functions; Signal to noise ratio; Spectra
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2439/1/012018

We present the results of investigations of the oxygen B-band R-branch transitions with intensities in the range from 1.5 × 10 −26 to 2.5 × 10 −28 cm −1 /(molecule/cm 2 ) and the total angular momentum quantum number for the lower state, J ”, up to 38. High resolution CRDS laboratory spectra were fitted with the Voigt profile as well as with advanced line-shape functions consistent with the Hartmann–Tran profile, that is the speed-dependent Voigt profile and speed-dependent Nelkin–Ghatak profile using the multispectrum fitting technique. The line positions, line intensities and other line-shape parameters, together with our previous data, were collated to show trends for the whole R branch. Using the determined frequencies of the B-band transitions, the Dunham fit was performed to obtain spectroscopic parameters for both ground and excited states. Newly recorded spectra at the band head, with the signal-to-noise ratio above 20000, were analyzed with line profiles including also the line mixing. First-order line mixing determined directly from the line shape fitting at relatively low pressure (32 Torr) is in good agreement with values calculated by Sung et al . [1].