Knowledge Bank

The oxygen molecule is known to display in known to display an extremely weak rotation vibration spectrum which is mainly attributable to an electric quadrupole (ED) transition our to the impaticel electronic spin in the ground state ($x3Sigmag-$) a magneus dipole (MD) colsibition to the intensities of branches with $\Delta J=D-1$ is concetivable. But this must necessrily arise through indirect mechanism$\mathrm{<mrow\; data-mjx-texclass="ORD">2,3</mrow>}$ since the maghetic moment is largely independent sepelation.Nevertheless. because of the intrasically higher strenghth of MD transitrons. the small intensities which do result may yet be comparable to the to contribution. In the talk a rigorous theretical approach to line intensitis in the $o2$ fundamantal bond will be presented which (1) evaluates the ED and MD contributions. (1) includes refinments due to vibration-rotation interaction and (111) incorporats in the calculation the intermediate nature of the coupling in the $x2\Sigma g1$ state.