Interference effects in the excitation of resonances with fine structure—an application to the predissociation in the B→A system of the deutroxyl radical

The predissociation in the B→A system of the deutroxyl radical has been reinvestigated. The experimental line shapes $P17$, $P18$, $R18$, $P20$, and $P21$ of the (0,9) band of the system are analyzed in the framework of the Mahaux-Lejeune theory. The $P18$ and $R18$ transitions contain a Q component. This lends support to existing calculations that a ⁴Π repulsive state is responsible for the predissociation. The transition probability to the continuum is not contant, but varies as the predissociated half-width.