ИСТИНА

Continuing our efforts to study the temperature dependencies of line parameters for different molecules, we present here our results for an extensive analysis of 40 spectra of pure carbon monoxide and carbon monoxide mixed with air recorded at temperatures ranging between 79 K and room temperature. All spectra have been recorded using the 1-m Fourier Transform spectrometer located at Kitt Peak, AZ, USA and two temperature controlled gas cells. Line positions of carbon dioxide and water [1] have been used in the calibration. The analysis was carried out using a multispectrum analysis software [2] 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 [3] for each of the absorber-perturber pairs CO-CO, CO-N2 and CO-O2. The variation of the half-width coefficients for CO-N2 over a range of temperatures has been computed based on a potential energy surface of Tipping-Herman type and by considering electrostatic interactions and vibrationally independent potentials. The experimentally retrieved temperature dependencies of line parameters have been compared with the results of calculations for CO-N2 and with previous published results. 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 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 and O. Byzykin 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). References: 1. I.E. Gordon, L.S. Rothman, C. Hill, R.V. Kochanov, Y. Tan, P.F. Bernath, et al. J. Quant. Spectrosc. Radiat. Transfer 203, 3–69 (2017). 2. D.C. Benner, C.P. Rinsland, V.M. Devi, M.A.H. Smith, D. Atkins, J. Quant. Spectrosc. Radiat. Transfer 53(6), 705-721 (1995). 1995. 3. J.O. Hirschfelder, C.F. Curtiss, R.B. Bird, Molecular theory of gases and liquids. New York: Wiley and Sons, 1952.