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).

Bruker IFS 125HR 傅里叶变换光谱仪已用于测量光谱范围 6000–7000 cm ^-1内的纯二氧化碳透射光谱，包括频段 30011-00001、30012-00001、30013-00001、30014-00001 和 00031-00001。在 295 K 下进行了总共 10 次测量，吸收路径长度介于 14.6 和 59.4 m 之间，样品压力介于 3 到 80 mbar 之间。使用多光谱拟合方法应用扩展的 Hartmann-Tran 剖面，首先考虑 Rosenkranz 中的线混合阶微扰近似。线位置、自位移、强度、自加宽宽度、它们的速度依赖性以及在某些情况下的线混合被调整以适合测量。已经进行了严格的误差分析。这项工作的主要目标是研究傅立叶变换光谱是否可以将线强度精度降低到 0.1% 的水平。在这项工作中，已经实现了 0.15% 的组合系统标准不确定度，进一步改进到 0.1% 的水平是可行的。据我们所知，傅立叶变换光谱法以前没有达到组合标准不确定度的达到水平。与最近的工作进行了比较，包括线位置、线强度、自展宽及其速度依赖性以及自位移。Zenodo (doi:10.5281/zenodo.4525272) 上提供了测量和线路参数数据库。