High accuracy CO2 Fourier transform measurements in the range 6000–7000 cm−1

• DOI: 10.1016/j.jqsrt.2021.107791
• Publication Date: 2021-06-10T01:36:20Z
• Authors: M. Birk; C. Röske; G. Wagner
• Keywords: Near infrared line parameters; Line positions; High accuracy Fourier transform measurements; Carbon dioxide; Intensities; Self-broadened line shape parameters; 01 natural sciences; 0105 earth and related environmental sciences

Abstract A Bruker IFS 125HR Fourier-transform spectrometer has been used to measure pure carbon dioxide transmittance spectra in the spectral range 6000–7000 cm−1, including the bands 30011-00001, 30012-00001, 30013-00001, 30014-00001, and 00031-00001. A total of 10 measurements with absorption path lengths between 14.6 and 59.4 m and sample pressures from 3 to 80 mbar were performed at 295 K. A multispectrum fitting approach was used applying the Hartmann-Tran profile extended to account for line mixing in the Rosenkranz first order perturbation approximation. Line positions, self-shifts, intensities, self-broadened widths, their speed dependence and in some cases line mixing were adjusted for fitting the measurements. A rigorous error analysis has been performed. The primary goal of this work was to investigate whether Fourier transform spectroscopy can deliver line intensity accuracy down to the 0.1% level. In this work, a combined systematic standard uncertainty of 0.15% has been achieved, further improvements down to the 0.1% level are feasible. The achieved level of combined standard uncertainty has, to our knowledge, not been reached by Fourier-transform spectroscopy before. Comparisons with most recent work are presented for line positions, line intensities, self-broadening and its speed dependence, and self-shifts. Measurement and line parameter databases are provided on Zenodo (doi: 10.5281/zenodo.4525272 ).