Abstract
Abstract A theoretical calculation of the fundamental vibration-rotation spectra of HCl, HBr and HI in liquid Xe is presented. The main characteristics of these spectra (essentially the existence of the P, Q, and R branches) are explained from the decomposition of the rotational motion of the diatomic as a quasi-free rotational motion and a rotational diffusion motion. The used spectral theory involves only a reduced set of statistical parameters concerning the diatomic and the diatomic-liquid medium interaction: the mean square of the interaction, its correlation time, the vibrational dephasing time, the rotational diffusion constant and the fraction of molecules executing rotational diffusion motion. By comparison between theoretical and experimental spectra, the behavior of the statistical parameters with the rotational constant of the diatomic molecules is also discussed.
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