CRDS line-shape study of the (7-0) band of CO

Aleksandr A Balashov; Szymon Wójtewicz; Jolanta Domysławska; Roman Ciuryło; Daniel Lisak; Katarzyna Bielska

doi:10.1016/j.saa.2024.124041

CRDS line-shape study of the (7-0) band of CO

Spectrochim Acta A Mol Biomol Spectrosc. 2024 May 5:312:124041. doi: 10.1016/j.saa.2024.124041. Epub 2024 Feb 14.

Authors

Aleksandr A Balashov¹, Szymon Wójtewicz¹, Jolanta Domysławska¹, Roman Ciuryło¹, Daniel Lisak¹, Katarzyna Bielska²

Affiliations

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

PMID: 38368819
DOI: 10.1016/j.saa.2024.124041

Abstract

We present the results of the spectral line-shape study of the first measurement of the extremely weak (7-0) band of the ¹²C¹⁶O molecule. Measurements were done with a highly sensitive cavity ring-down spectrometer. Collisional narrowing, analyzed in terms of speed-dependent effects, was observed for the first time for transitions with line intensities below 2⋅10^-29 cm/molecule at 296 K. We provide a full set of line-shape parameters of the speed-dependent and regular Voigt profile analysis for 14 transitions from P and R branches. Experimental verification of a strong vibrational dependence of the pressure shifting described by the Hartmann model (Hartmann, 2009) is extended up to the sixth overtone highly sensitive to the model parameter.

Keywords: Carbon monoxide; Cavity ring-down spectroscopy; High resolution molecular spectroscopy; Pressure broadening and shifting; Spectral line shapes; Speed-dependent effects.