The absorption spectra of carbon dioxide were recorded in the region from 15,000 to 15,300 cm⁻¹, using a Bruker IFS 125 HR Fourier transform spectrometer and a 30 m multipass cell with the White type optical system. The recording was performed at a spectral resolution of 0.044 – 0.050 cm⁻¹, room temperature, a path length of 1057.95 m and pressures of 185 and 362 mbar. Utilization of a LED as a light source provided a sensitivity (noise equivalent absorption) at the level of k_ν = 1.23 × 10^-10 cm⁻¹ and allowed detection of a number of lines of two 3005i − 00001 (i = 2,3) bands and several lines of the 60031 – 00001 band of ¹²C¹⁶O₂ with the intensity values down to 10^-30 cm⁻¹/(molecule cm⁻²) at 296 K. These bands were observed for the first time. The uncertainty of the line position measurements was estimated to be about 0.005 cm⁻¹ for the unblended lines with a high signal-to-noise ratio. The uncertainties of the retrieved line intensities for the strongest unblended lines are at the level of 15 %. The spectroscopic constants for observed bands were fitted to the observed line positions. The vibrational transition dipole moments squared of these bands were fitted to the observed line intensities. The measured line positions were compared to those from the HITRAN2020 database and to those predicted with the global effective Hamiltonian. The measured line intensities were compared to the values from the HITRAN2020 database and from the Ames2021 line list.

使用Bruker IFS 125 HR傅立叶变换光谱仪和具有怀特型光学系统的30 m多通道池，在15,000至15,300 cm ^-1区域记录二氧化碳的吸收光谱。记录在0.044 – 0.050 cm ^-1的光谱分辨率、室温、1057.95 m 的路径长度以及185 和362 mbar 的压力下进行。利用 LED 作为光源提供了k _ν  = 1.23 × 10 ^-10 cm ^-1水平的灵敏度（噪声等效吸收），并允许检测两条 3005 i − 00001 ( i  = 2, 3) ¹² C ¹⁶ O ₂的60031 – 00001 谱带的谱带和几条谱线，在296 K 时强度值低至10 ^-30 cm ^-1 /(分子cm ^-2 )。这些谱带为首次观测到。对于具有高信噪比的未混合线，线位置测量的不确定性估计为约0.005cm ^{-1 。}检索到的最强未混合线的线强度的不确定性为 15%。将观察到的带的光谱常数拟合到观察到的线位置。这些带的振动跃迁偶极矩的平方适合观察到的线强度。将测量的线位置与 HITRAN2020 数据库中的线位置以及全局有效哈密顿量预测的线位置进行比较。将测得的线强度与 HITRAN2020 数据库和 Ames2021 线列表中的值进行比较。