This paper report nitrogen- and oxygen-broadening coefficients, their speed-dependencies, and the collisional narrowing parameters of lines in the ν-band of methane. The parameters were determined from low (150 K) to high temperatures (600 K). The measurements were done with a high-resolution quantum cascade laser spectrometer coupled to specific absorption cells that allow to cool and heat the gas mixtures with a great stability. The spectroscopic parameters were determined at each temperature by fits of the experimental absorbances in a multispectrum fitting procedure using the Voigt, Speed-Dependent Voigt, Nelkin-Ghatak and Speed-dependent Nelkin-Ghatak theoretical line shape models. The temperature dependencies of the collisional half-widths, the speed-dependence of the broadening coefficients as well as the collisional narrowing parameters were studied with the empirical power law and the physics-based Gamache-Vispoel model (DPL) [Gamache and Vispoel, JQSRT, 217, 440–452, 2018]. The obtained line shape parameters and their temperature dependencies are compared, when possible, to existing data in literature. The DPL reproduces more accurately the evolution of the studied collisional parameters over the wide range of temperature considered in the study.

中文翻译：

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通过量子级联激光光谱研究 N2 和 O2 展宽甲烷谱线的谱线形状参数的温度依赖性


本文报告了氮和氧展宽系数、它们的速度依赖性以及甲烷 ν 带中谱线的碰撞窄化参数。参数是从低温 (150 K) 到高温 (600 K) 确定的。测量是通过与特定吸收池耦合的高分辨率量子级联激光光谱仪完成的，该吸收池可以非常稳定地冷却和加热气体混合物。使用 Voigt、速度相关的 Voigt、Nelkin-Ghatak 和速度相关的 Nelkin-Ghatak 理论线形模型，通过多光谱拟合程序中的实验吸光度拟合来确定每个温度下的光谱参数。利用经验幂律和基于物理的 Gamache-Vispoel 模型 (DPL) 研究了碰撞半宽度的温度依赖性、展宽系数的速度依赖性以及碰撞窄化参数 [Gamache 和 Vispoel, JQSRT , 217, 440–452, 2018]。如果可能的话，将获得的线形参数及其温度依赖性与文献中的现有数据进行比较。 DPL 更准确地再现了研究中考虑的较宽温度范围内所研究的碰撞参数的演变。