We measured air broadening in the (30012) ← (00001) carbon dioxide (CO₂) band up to Jʺ = 50 using frequency-agile rapid scanning cavity ring-down spectroscopy. By using synthetic air samples with varying levels of nitrogen, oxygen, and argon, multi-spectrum fitting allowed for the collisional broadening terms of each major air component to be simultaneously determined in addition to advanced line shape parameters at atmospherically relevant CO₂ mixing ratios. These values were compared to broadener-specific line shape parameters from the literature. Fits to measured spectra were also constrained with results from requantized classical molecular dynamic simulations. We show that this approach enables differentiation between narrowing mechanisms in advanced line shape parameters retrieved from experimental spectra of limited signal-to-noise ratio.

我们测量在（30012）←（00001）二氧化碳的空气增宽（CO ₂）频带高达Ĵ “= 50使用频率捷变的快速扫描光腔衰荡光谱法。通过使用氮气，氧气和氩气含量不同的合成空气样品，多光谱拟合不仅可以在大气相关的CO ₂处获得先进的线形参数，还可以同时确定每种主要空气成分的碰撞展宽项。混合比例。将这些值与文献中特定于增白剂的线形参数进行比较。对测量光谱的拟合也受到重新量化的经典分子动力学模拟结果的限制。我们表明，这种方法可以区分从有限信噪比的实验光谱中检索的高级线形参数中的变窄机制。