Knowledge Bank

Analysis of new high resolution photographs of the $A3\Pi i-X3\Sigma -$ systems of $OH+$ and $OD+$ (in the region $3000-4500\backslash AA$) has led to a more complete understanding of the rotational structures of the bands at low quantum numbers. Various rotational perturbations and other irregularities in the A-doubling of the $A3\Pi i$, state can be explained if the $b1\Sigma +$ state is assumed to lie about $1200cm-1$ above the $A3II$ state. It is probable that interactions between the two $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}\Sigma -$ states arising from atomic products $H+O+$ and $O+H+$ cause distortion of the ground state potential energy curve.