Pressure and temperature dependencies of air-perturbed O2 B-band line shapes

Katarzyna Bielska; Duc Dung Tran; Aleksandr A Balashov; Jolanta Domysławska; Szymon Wójtewicz; Marcin Bober; Sławomir Bilicki; Roman Ciuryło; Daniel Lisak

doi:10.1016/j.saa.2023.123185

Pressure and temperature dependencies of air-perturbed O₂ B-band line shapes

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Dec 15:303:123185. doi: 10.1016/j.saa.2023.123185. Epub 2023 Jul 25.

Authors

Katarzyna Bielska¹, Duc Dung Tran², Aleksandr A Balashov², Jolanta Domysławska², Szymon Wójtewicz², Marcin Bober², Sławomir Bilicki², Roman Ciuryło², Daniel Lisak³

Affiliations

¹ Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland. Electronic address: kbielska@umk.pl.
² Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland.
³ Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland. Electronic address: dlisak@umk.pl.

PMID: 37544214
DOI: 10.1016/j.saa.2023.123185

Abstract

The air-broadened lines from the oxygen B band were measured for the first time in controlled laboratory conditions with a high signal-to-noise ratio using frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) referenced to the optical frequency comb. Spectra measured at various pressures and temperatures were analyzed with an advanced line-shape model, considering the speed-dependence of collisional broadening and shift, and the effect of velocity-changing collisions. The temperature dependence of collisional broadening and shift is determined, whereas no significant temperature dependence of speed-dependent parameters and Dicke narrowing was observed. In addition, we have demonstrated that reasonable estimation of temperature dependence for pressure broadening is possible even from measurements done in single temperature where the speed dependence of pressure broadening was determined. New spectroscopic data improve the accuracy of the air-broadened oxygen B-band spectra description by an order of magnitude.

Keywords: Cavity ring-down spectroscopy; Oxygen B band; Spectral line shapes; Temperature dependence.