On the temperature dependence of the intensity of the induced absorption of oxygen in a region of the Herzberg photodissociation continuum in binary mixtures of oxygen with argon and nitrogen

Abstract

Values of the binary absorption coefficient μ12 in the induced Herzberg III band of oxygen for O2-Ar and O2-N2 pairs have been obtained for the first time in the range 200–215 nm and in the temperature interval 295–120 K. It has been found that, as the temperature decreases, the binary absorption coefficient increases continuously: for O2-Ar pairs, a marked increase in μ12 starts immediately from room temperature, and, for O2-N2 pairs, it begins at temperatures below 180 K. As the temperature decreases from room temperature to 120 K, μ12 increases roughly by 40 and 35% for O2-Ar and O2-N2 pairs, respectively. For each type of pairs, the dependence μ12(T) has been calculated with the use of the dipole moment function of the induced transition, taking into account both short-and long-range interactions, as well as the multiparametric isotropic potential of intermolecular interactions. It is shown that it is possible to select such parameters of the dipole moment function of the transition that the theoretical curve μ12(T) describes satisfactorily the experimental data on the temperature dependence of μ12 in the Herzberg III band for O2-Ar and O2-N2 pairs in the whole temperature range under study.