In the present paper, we discuss the rotational effect on interval conversion due to the linewidths and the Coriolis coupling in the final electronic state. For a formaldehyde model system, some numerical results of the rotational effect will be reported. It will be seen that the Coriolis coupling plays an important role in small linewidth cases. The numerical results also include the effect of the vibration-rotation coupling through the change of moments of inertia; the change of the geometry shifts between two electronic states due to this coupling is calculated numerically.
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