Abstract
The results of an algebraically computed double Van Vleck perturbation theory are reported for combined anharmonic and Coriolis perturbations to a degenerate harmonic oscillator. The results to sixth order in the anharmonic coupling and comparable Coriolis coupling are in excellent agreement with exact calculations for systems with anharmonic splittings of up to 5% to 10% of the vibrational spacing. Particular care is required in handling Fermi resonance interactions in the algebraic computations.
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