Abstract

Quasidegenerate perturbation theory using a Bloch wave operator formalism is applied to the calculation of the rich resonance spectrum of a model polyatomic molecule undergoing photodissociation. The sharp structures (peaks and dips patterns) of the total dissociation rate as well as the partial probabilities to obtain the fragments at given internal states for various incident photon energies, are interpreted in terms of tunneling, shape or Feshbach resonances.

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