Journal of Physical Chemistry, Vol.99, No.36, 13380-13384, 1995
Influence of the Continuum - Continuum Interactions on the Shape of Resonances
Interesting features of the asymmetric resonances in the predissociation of the A(2) Sigma(+) state of the OH molecule are analyzed by close-coupled calculations. Asymmetric resonances in the partial cross sections for the dark dissociation channels ((4) Sigma- and (4) Pi) are attributed to the direct coupling of these states to a bright continuum state ((2) Sigma(-)). It is demonstrated that the nonvanishing background in the partial cross section for the bright state ((2) Sigma(-)) can result from the indirect (second-order) coupling of the state to the dark continuum states ((4) Sigma(-) and (4) Pi) via the discrete state (A(2) Sigma(+)). Interactions among the continuum states are shown to exert a profound influence on the shapes of the resonances in the partial cross sections and subsequently on the branching ratios of the dissociation products.