Journal of Quantitative Spectroscopy and Radiative Transfer ( IF 2.3 ) Pub Date : 2021-06-08 , DOI: 10.1016/j.jqsrt.2021.107790 Jidong Li , Yanjun Du , Yanjun Ding , Zhimin Peng
Wavelength modulation-direct absorption spectroscopy (WM-DAS) has been used to measure the absorption line shapes of the transition at 7299.431 cm and the CO transition at 4297.705 cm perturbed by Ar, and He. The foreign-gas broadening, narrowing and pressure-shift parameters were determined from various lineshape models at pressures from 1 to 100 kPa. The measured -broadening coefficients are the largest among the three perturbers and the measured - and Ar-pressure-shift coefficients are both negative while that for He is positive. The nonlinear pressure dependence of the velocity-changing rates for the Galatry and Rautian profiles and the speed-dependent coefficients for Speed-dependent Voigt profile were all observed for the 6 binary systems. The measured velocity-changing rates were all larger than the corresponding dynamic friction coefficients in -Ar//He while smaller than those in CO-Ar//He. The narrowing parameters were also retrieved and compared by taking both the Dicke narrowing and speed dependent effects into account. The partially Correlated quadratic Speed-dependent Hard-Collision profile was simulated and fit by the other simplified profiles to further validate the nonlinear behaviour of the narrowing parameters, which is consistent with the measured results.
中文翻译:
使用 WM-DAS 方法测量光谱参数的线形模型的实验和模拟研究 - 第二部分:选择近红外的增宽和变窄 和被 Ar 扰动的 CO 线, 和他
波长调制直接吸收光谱 (WM-DAS) 已被用于测量吸收线形状 7299.431 厘米处的过渡 和 CO 跃迁在 4297.705 cm 受到 Ar 的干扰, 和他。从 1 到 100 kPa 压力下的各种线型模型确定外来气体展宽、变窄和压力偏移参数。被测-broadening 系数在三个扰动和实测中最大 - 和 Ar 压力位移系数均为负,而 He 为正。对于 6 个二元系统,Galatry 和 Rautian 剖面的速度变化率的非线性压力依赖性以及与速度相关的 Voigt 剖面的速度相关系数都被观察到。测得的速度变化率均大于相应的动摩擦系数-Ar//He虽然比CO-Ar中的小//他。还通过考虑 Dicke 变窄和速度相关效应来检索和比较变窄参数。部分相关的二次速度相关硬碰撞剖面被其他简化剖面模拟和拟合,以进一步验证变窄参数的非线性行为,这与测量结果一致。