A voided crossings influence spectra and intramolecular redistribution of energy. A semiclassical theory
of these avoided crossings shows that when primitive semiclassical eigenvalues are plotted vs a parameter
in the Hamiltonian they cross instead of avoiding each other. The trajectories for each are connected by a
classically forbidden path. To obtain the avoided crossing behavior, a uniform semiclassical theory of
avoided crossings is presented in this article for the case where that behavior is generated by a classical
resonance. A low order perturbation theory expression is used as the basis for a functional form for the
treatment. The parameters in the expression are evaluated from canonical invariants (phase integrals)
obtained from classical trajectory data. The results are compared with quantum mechanical results for
the splitting, and reasonable agreement is obtained. Other advantages of the uniform method are
described
