TEMPERATURE-DEPENDENCE OF SELF- AND AIR-BROADENED CO LINE SHAPES IN THE FUNDAMENTAL BAND

We present results of an extensive analysis of the CO 1$\leftarrow$0 band in 40 spectra of pure carbon monoxide and carbon monoxide mixed with air recorded at temperatures ranging between 79 K and room temperature. All spectra were recorded using the 1-m McMath-Pierce Fourier Transform spectrometer located at Kitt Peak, AZ, USA and two temperature-controlled gas cells. The analysis was carried out using multispectrum fitting software\footnote{D.~C.~Benner, C.~P.~Rinsland, V.~Malathy Devi, M.~A.~H.~Smith and D.~A.~Atkins, \textit{JQSRT} \underline{\textbf{53}} (1995) 705-721.} and the Voigt, speed-dependent Voigt and Rautian line shape models. When using the Rautian model, we employed calculated narrowing parameters obtained from computed diffusion constants\footnote{J.~O.~Hirschfelder, C.~F.~Curtiss and R.~B.~Bird, \underline{Molecular theory of gases and liquids}, New York, Wiley and Sons, 1952.} for each of the absorber-perturber pairs CO-CO, CO-N$_2$ and CO-O$_2$. The experimentally retrieved temperature dependences of the line shape parameters are been compared with previous published results and with the results of calculations for CO-N$_2$. We thank D.~Chris Benner for the Labfit software. The work of V.~M.~Devi was funded by NASA grants and contracts, and the research by M.~A.~H.~Smith was performed as part of her former employment at NASA Langley Research Center. No official endorsements are intended or implied. N.~Islam and A.~Predoi-Cross have been funded by NSERC. S.~Ivanov received financial support from the Ministry of Science and Higher Education within the State assignment FSRC "Crystallography and Photonics" RAS and Russian Science Foundation (Project No.18-55-16006)