Knowledge Bank

The collision--induced infrared fundamental band of $D2$ In $D2-N2$ and $D2-CO$ binary mixtures was studied at room temperature at a sample path length of 105.2 cm at various densities of the binary mixtures up to 113 amagat for several base densities of $D2$. Integrated absorption coefficients were obtained. An analysis of the absorption profiles was carried out by assuming appropriate line $shapes1$and the characteristic half-width parameters $\delta d$ and $\delta c$ of the short-range overlap-induced transtitions and $\delta q$ of the long-range quadrupole-induced transitions were determined. From the analysis the contributions to the intensity of the band due to overlap and quadrupolar interactions were separated. Unlike $N2$, CO has a small permanent electric dipole moment. However, present analysis did not reveal any detectable contribution to the intensity of the band from the electric dipolar induction mechanism.