Pressure broadening coefficients of CO₂ perturbed by buffer gases (N₂, O₂, He, and Ar) were studied for four absorption lines R(62), R(64), R(66) and R(68) belonging to the ν₃ band in the 4.2 μm region with tunable diode laser absorption spectroscopy at room temperature for the first time. The broadening coefficients were retrieved by fitting the absorption spectrum with the quadratic speed-dependent Voigt (qSDV) profile. It was shown that the measured broadening coefficients have a behavior of γ(Ar) < γ(O₂) < γ(He) < γ(N₂). The broadening coefficients by air and Ar were in good agreement with available values in the HITRAN 2016 database and previous measurements in the literature for the same band.

研究了四个吸收线R（62），R（64），R（66）和R（68）对缓冲气体（N ₂，O ₂，He和Ar）扰动的CO _2的压力展宽系数。ν ₃带中，在室温下可调谐二极管激光吸收光谱的第一次的4.2微米的区域。通过将吸收光谱与速度相关的二次Voigt（qSDV）曲线拟合来获得加宽系数。结果表明，测得的扩宽系数具有γ（Ar）<  γ（O ₂）<  γ（He）<  γ（N _{2）的行为。}）。空气和Ar的增宽系数与HITRAN 2016数据库中的可用值以及文献中相同频段的先前测量值非常吻合。