SPECTRAL SHAPE PARAMETERS OF SOME NITROGEN BROADENED METHANE TRANSITIONS AT ROOM TEMPERATURE USING THE SPEED DEPENDENCE-AND DICKE NARROWING-MODELS

DOI: 10.18173/2354-1059.2023-0059

Tóm tắt

In this work, spectral shape parameters of some isolated transitions in the infrared region of methane diluted in nitrogen at room temperature are obtained using two refined line-shape models including the Rautian and the speed dependent Voigt profiles as well as the simple Voigt one. The measured absorption spectra at large pressure ranges were one-by-one fitted with these models using the least-squares method. The obtained result reconfirmed that non-Voigt effects must be taken into account to get a better fit residual and fit quality. Pressure dependence of the Dicke narrowing parameter and the speed dependent components of line width and shift were also obviously observed. The obtained line shape parameters are in good agreement with the literature.