The pressure - induced fundamental band of oxygen in pure gas and in oxygen - foreign gas mixtures at 298°K and at 201°K

摘要

The pressure - induced fundamental vibration - rotation absorption band of oxygen was studied in the pure gas and in an oxygen - argon mixture at 298°K and in the pure gas and in oxygen nitrogen, oxygen-argon mixtures at 201°K at total pressures up to 300 atmospheres. The absorption profiles obtained in each case showed the pronounced Q and S branches with an indication of the less resolved O branch. The integrated absorption coefficients obtained from the absorption profiles were found to follow an empirical power series in terms of the partial densities of the component gases. A plot of -- [special characters omitted] -- for pure oxygen and of -- [special characters omitted] -- for mixtures was found to be a straight line from which the binary and ternary absorption coefficients were determined. Applying the theory of Van Kranendonk it was found that the overlap contribution to the binary absorption coefficient was negligible and from the known molecular constants the derivative of the molecular quadrupole moment of oxygen, Q', with respect to the internuclear distance at the equilibrium position was determined. The value of Q' obtained was 1.6 eaₒ which is equal to that determined by Shapiro and Gush (1966).