Abstract
In order to assign the rotational spectrum of a slightly asymmetric molecule, we suggest a graphical method based on an expression of the frequencies obtained by calculating the energy levels by a perturbation treatment. We apply this method to the species obtained by substituting a 13C atom (or 18O) to a 12C atom (or 16O) in the molecule of trioxane. Accurate molecular constants of these species have been determined using Watson's theory developed up to the “quartic” terms. The structure of the symmetric top is deduced as well as the rotational constant associated with the symmetry axis.
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