Spectra of CO₂ + H₂ mixtures have been recorded at room temperature by using the cavity ring down technique, for four spectral intervals in the 2.12–2.35 µm CO₂ transparency window which is within the (1-0) band of H₂. The binary coefficients $B_{\mathrm{C}{\mathrm{O}}_2-{\mathrm{H}}_2}+B_{{\mathrm{H}}_2-\mathrm{C}{\mathrm{O}}_2}$ have been retrieved from the spectra recorded at different pressures after subtraction of the CO₂ monomer contribution and of the H₂-H₂ and CO₂-CO₂ collision induced absorptions (CIAs). In order to reduce the uncertainties, new measurement of the pure H₂ CIA, the main subtracted contribution, at the percent level are also reported. The new set of experimental binary coefficients is compared to values provided by semi-empirical calculations made with the assumption of an isotropic CO₂-H₂ interaction potential and neglecting the short-range interaction-induced electric dipole. This comparison shows the limits of using such a model, which is the only one available, in that spectral region.

通过使用腔衰荡技术在室温下记录了CO ₂  + H ₂混合物的光谱，该光谱在2.12–2.35 µm CO ₂透明度窗口（位于H ₂（1-0）范围内）中有四个光谱间隔。二进制系数${乙}_{\mathrm{C}{\mathrm{Ø}}_2-{\mathrm{H}}_2}+{乙}_{{\mathrm{H}}_2-\mathrm{C}{\mathrm{Ø}}_2}$在减去CO ₂单体贡献以及H ₂ -H ₂和CO ₂ -CO ₂碰撞诱导吸收（CIAs）后，从在不同压力下记录的光谱中已经获得了α-己内酰胺。为了减少不确定性，还报告了在百分比水平上对主要减去的贡献H ₂ CIA的新测量。将新的实验二进制系数集与假设为各向同性CO ₂ -H _2的半经验计算所提供的值进行比较相互作用势而忽略了短程相互作用引起的电偶极子。这种比较显示了在该光谱区域中使用这种唯一可用的模型的局限性。