Quantum mechanical and semiclassical results are compared for the spectrum of the Morse oscillator. When average quantum number [(n + m)/2] trajectory is employed for an n → m transition, good agreement is between the quantum and semiclassical intensities and between the frequencies, for the fundamental the overtones studied. Spectra of nonrotating OCS in the quasiperiodic and chaotic regions are presented, the intensities of a number of overtones and combination bands are calculated. Even very low intensity are observed.
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Koszykowski et al. (1982) studied this question.