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Mode specific resonance decay is demonstrated directly by Fast Fourier Transform (FFT) time propagation of resonance wave packets for an ABA molecule modeled by coupled Morse oscillators. Fast and slow decay correlates with local and hyperspherical modes which have their wave function lobes directed towards dissociation exits and ridges of the potential, respectively, in excellent analogy to Hose and Taylor's analysis of the Hénon‐Heiles system. The decay shows no correlation with energy or symmetry. The FFT method yields details of the decay mechanism. The results are related to observations of mode specific unimolecular processes in bulk.
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Bisseling et al. (1985) studied this question.
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