Abstract
The effect of classical chaos on the quantized energy spectrum is investigated for a variety of kinetically coupled Morse systems with two degrees of freedom. It is shown that, for both the energy range and mass ratios generating a global chaos, the positions of spacing coordinates giving the peaks of the nearest-neighbor level-spacing histograms are sufficiently close to those giving the maxima of the Wigner distributions. The classical-to-quantum correspondence is conjectured to be rather mild for a three-atom system composed of ordinary light atoms.
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