ИСТИНА

We present the results from a spectroscopic study of 29 spectra of the fundamental band of pure carbon monoxide and carbon monoxide mixed with air, recorded at 0.005 cm-1 resolution over a range of temperatures (79 K to 296 K) using the Fourier Transform spectrometer formerly located at the National Solar Observatory on Kitt Peak, AZ. Two variable temperature gas cells made of copper were used to record the spectra. The spectra were calibrated using line positions of carbon dioxide and water vapor present in the spectra as impurities, taken from Ref. [1]. The spectra were analyzed using the multispectrum fitting software described in Ref. [2]. Voigt, speed-dependent Voigt and Rautian line shape models have been employed in the analysis. The narrowing parameters needed for analysis using the Rautian model had no rotational quantum number dependence. They were computed using diffusion constants for CO-CO, CO-O2, and CO-N2 obtained using the method described in Ref. [3]. Line intensities, air- and self-broadening coefficients, pressure induced air- and self-shift coefficients, Einstein A-coefficients and line-mixing parameters have been retrieved. The exponential power gap scaling law has been used to calculate line-mixing parameters. The N2-broadened carbon monoxide half-width coefficients have been calculated at different temperatures using a potential energy surface based on Tipping-Herman intermolecular interaction and taking the electrostatic interactions into account. This computational method ensures that the three dimensional motion of the molecule is accounted for. However, the calculations used vibrationally independent potentials. We have compared our measurement results with theoretical calculations obtained for CO-N2 systems and with previous published measurements for the CO-air system. References [1] Gordon IE, Rothman LS, Hill C, Kochanov RV. Tan Y, Bernath PF, et al. 2017. The HITRAN2016 Molecular Spectroscopic Database. J Quant Spectrosc Radiat Transf 203 3- 69. [2] Benner DC, Rinsland CP, Devi VM, Smith MAH, Atkins D 1995. A multispectrum nonlinear least squares fitting technique. J. Quant. Spectrosc. Radiat. Transfer 53(6) 705-721. [3] Hirschfelder JO, Curtiss CF, Bird RB 1954. Molecular theory of gases and liquids. New York: Wiley and Sons.