<title>CDSD-1000: the high-temperature carbon dioxide spectroscopic databank and information system</title>

Abstract

We present a high-temperature version, CDSD-1000, of the Carbon Dioxide Spectroscopic Databank and the associated information system on the spectroscopy of the carbon dioxide molecule. The databank contains the line parameters (positions, intensities, air- and self-broadened halfwidths and coefficients of temperature dependence of air-broadened halfwidths) of the four most abundant isotopic species of CO₂. The reference temperature is <i>T_ref</i>=1000 K and the intensity cutoff is <i>I_cut</i>=10^-27cm^-1/(molecule cm^-2). More than 3 million lines covering the 260-8310 cm^-1, 418-2454 cm^-1, 394-4662 cm^-1, and 429-2846 cm^-1spectral ranges for ¹²C¹⁶O₂, ¹³C¹⁶O₂, ¹²C¹⁶O¹⁸O, and ¹²C¹⁶O¹⁷O, respectively, are included in to CDSD-1000. The line positions and line intensities have been generated within the framework of the method of effective operators. The calculations are based on global fittings of parameters of effective Hamiltonians and effective dipole moment operators to the observed data collected from the literature. The line widths and coefficients of temperature dependence of the line widths have been generated using a semi-empirical approach. Line-by-line simulations of several medium resolution high-temperature (<i>T</i>=1000-1550 K) spectra have been performed in order to validate the databank. CDSD-1000 is freely accessible via ftp://ftp.iao.ru/pub/CDSD-1000. An information system on the spectroscopy of carbon dioxide molecule based on CDSD databank (http://cdsd.iao.ru and http://cdsd.lpma.jussieu.fr) has been elaborated. It allows users to calculate absorption coefficients, absorption, transmittance, radiance in wide ranges of temperatures and pressure for defined isotopic abundance and path length. This system also allows for modeling of spectra recorded with different kinds of spectrometers at different resolutions.