In this study, quantitative model of two-photon excitation and fluorescence spectra of carbon monoxide based on up-to-date spectroscopic constants collected during an extensive literature survey was developed. This semi-classical model takes into account Hönl–London factors, quenching effects (collisional broadening and shift), ionization and stark effect (broadening and shift), whereas predissociation is neglected. It was specifically developed to first reproduce with a high confidence level the behavior of our experimental spectra obtained from laser-induced fluorescence (LIF) measurements, and then to allow us to extrapolate the fluorescence signal amplitude in other conditions than those used in these experiments. Synthetic two-photon excitation and fluorescence spectra of CO were calculated to predict the fluorescence signal at high pressures and temperatures, which are representative of gas turbine operating conditions. Comparison between experimental and calculated spectra is presented. Influence of temperature on both excitation and fluorescence spectra shapes and amplitudes is well reproduced by the simulated ones. It is then possible to estimate flame temperature from the comparison between experimental and calculated shapes of numerical excitation spectra. Influence of pressure on both excitation and fluorescence spectra was also investigated. Results show that for temperature below 600 K and pressure above 0.1 MPa, the usual Voigt profile is not suitable to reproduce the shape of the excitation spectrum. We found that the Lindholm profile is well suited to reproduce the pressure-dependence of the spectrum in the range 0.1 to 0.5 MPa at 300 K, and 0.1 to 0.7 MPa at 860 K. Beyond 0.7 MPa, in this temperature range, it is shown that the Lindholm profile does no longer match the spectral profiles, in particularly the red wing. Further analyses taking into account the line mixing phenomenon at higher pressure are thus discussed.

中文翻译：

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Express：在高温高压下模拟一氧化碳双光子激光诱导荧光 (LIF) 光谱

在这项研究中，基于在广泛文献调查期间收集的最新光谱常数，开发了双光子激发和一氧化碳荧光光谱的定量模型。该半经典模型考虑了 Hönl-London 因素、猝灭效应（碰撞展宽和位移）、电离和明显效应（展宽和位移），而忽略了预解离。它是专门开发的，首先以高置信度重现我们从激光诱导荧光 (LIF) 测量中获得的实验光谱的行为，然后让我们能够推断出这些实验中使用的条件以外的其他条件下的荧光信号幅度。计算了 CO 的合成双光子激发和荧光光谱，以预测高压和高温下的荧光信号，这是燃气轮机运行条件的代表。给出了实验光谱和计算光谱之间的比较。模拟结果很好地再现了温度对激发和荧光光谱形状和幅度的影响。然后可以通过比较实验和计算的数值激发光谱形状来估计火焰温度。还研究了压力对激发光谱和荧光光谱的影响。结果表明，对于低于 600 K 的温度和高于 0.1 MPa 的压力，通常的 Voigt 曲线不适合再现激发光谱的形状。我们发现 Lindholm 剖面非常适合再现 300 K 时 0.1 至 0.5 MPa 和 860 K 时 0.1 至 0.7 MPa 的光谱的压力依赖性。超过 0.7 MPa，在此温度范围内，显示Lindholm 剖面不再匹配光谱剖面，尤其是红翼。因此讨论了考虑高压下管线混合现象的进一步分析。