Fig. 1.

Panel a: section of the jet-cooled CP-FTMW spectrum of methoxyacetaldehyde with an assignment of a-type R-branch and b-type P-branch transitions. The A−E splitting due to the internal rotation of the methyl group is shown in the inset. Panel b: section of the millimeterwave spectrum of methoxyacetaldehyde, showing the central part of the J = 43 ← 42 rotational transition.
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