Indirect dephasing model and librovibrational spectra of diatomics trapped in rare gas matrices. Application to the case of CO/Ar

摘要

In the present work, the theoretical scheme applied to the study of hindered rotation of molecular impurity in rare gas matrices lsqb;J. Chem. Phys.77, 1757 (1982)rsqb; is extended to librational motion. The librational motions are considered as the intermediate modes in the process of vibrational dephasing. The effect of libronndash;phonons coupling is formally calculated for a three dimensional lattice. The case of CO dispersed in Ar is examined within the frame of a simple cubic lattice. Despite the oversimplified model, the computed temperature dependence of the vibrational absorption band adequately reproduces the observed experimental trend.