Vibrational energy levels of formaldehyde

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Abstract
Vibrational energies for nonrotating H2CO and D2CO are calculated using unadjusted and adjusted ab initio quartic force fields in normal mass‐weighted coordinates. Converged energies are obtained using uncoupled anharmonic oscillator and vibrational self‐consistent field basis sets and are compared with experiment. Strong ‘‘Fermi‐like’’ resonances are found involving the CH symmetric and antisymmetric stretches.

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