Additional Rotational Energy Levels ofH2O andD2O Molecules

Abstract

An extension of the pure rotational energy levels for ${\mathrm{H}}_{2}$O and ${\mathrm{D}}_{2}$O is made in order to obtain new possible microwave transitions. For ${\mathrm{H}}_{2}$O the levels are given through $J=14$ and for ${\mathrm{D}}_{2}$O through $J=15$. Additional assignments are made in the previously observed absorption spectra. The Wang secular determinant for the asymmetric rotator is expanded, and equations for the energy levels of $J=12$, 13, 14, and 15 are given in terms of the asymmetry parameter.