We present a high-temperature version, CDSD-1000, of the carbon dioxide spectroscopic databank. The databank contains the line parameters (positions, intensities, air- and self-broadened half-widths and coefficients of temperature dependence of air-broadened half-widths) of the four most abundant isotopic species of the carbon dioxide molecule. The reference temperature is Tref=1000°K and the intensity cutoff is Icut=10−27 cm−1/moleculecm−2. More than 3 million lines covering the 260–8310, 418–2454, 394–4662, and 429–2846 cm−1 spectral ranges for 12C16O2, 13C16O2, 12C16O18O, and 12C16O17O, respectively, are included in CDSD-1000. The databank has been generated within the framework of the method of effective operators and based on the global fittings of spectroscopic parameters (parameters of the effective Hamiltonians and effective dipole moment operators) to observed data collected from the literature. Line-by-line simulations of several low- and medium-resolution high-temperature (T=800-3000 K) spectra have been performed in order to validate the databank. Comparisons of CDSD-1000 with other high-temperature databanks HITEMP, HITELOR, and EM2C are also given. CDSD-1000 is able to reproduce observed spectra in a more satisfactory way than the high-resolution databank HITEMP for temperatures higher than 1000°K. The databank is useful for studying high-temperature radiative properties of CO2. CDSD-1000 is freely accessible via the Internet.
Papers with the following subject areas are suitable for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer:
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Absorption by pure CO2 and CO2-N2 mixtures in the 4.3 and 2.7 μm regions has been measured with a grating spectrometer with spectral resolution of 0.75 and 2cm-1, respectively and pressures between 0.03 and 1 atm, at room temperature and around 750 K. Measurements are compared with line-by-line calculations using the spectroscopic parameters considered for the 1991 edition of the HITRAN database and those calculated by Wattson and Rothman (W-R database) with the Direct Numerical Diagonalization (DND) method. Lorentzian profiles modified by the introduction of a frequency- and temperature-dependent line shape corrective factor χ have been used. At room temperature, calculations with the two databases are consistent and in good agreement with our experiments. At 750 K, calculations with HITRAN underestimate absorption both in line 4.3 and 2.7 μm regions, whereas those with the W-R database are in good agreement with the measurements, with latter slightly underestimating the absorption in the low frequency wing of the 4.3 μm band. This may be due to inaccuracies in the χ factors and the parameters of some hot bands.
