Abstract
The 4 0 0 and 4 2 0 bands of the a ̃ 3A 2 ← X ̃ 1A 1 absorption system of D 2CO formaldehyde were recorded under conditions of high resolution and were subjected to a rotational analysis. A model was developed for the out-of-plane mode Q 4 to describe the experimental data. It was constructed from a potential function which contained quadratic and Gaussian terms and a reduced mass which varied with the out-of-plane coordinate. The best agreement to the rotational constant data came from an inversion coordinate which combined the motions from both the θ(out-of-plane) and β(HCH) internal coordinates. Molecular structures are presented for the 4 0 and 4 2 levels as well as structures corresponding to the top, θ = 0, and the bottom, θ = θ min, of the double minimum potential.
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