Energies of the lowest rotational levels of NH3a); ND3b); NH2Dc) and NHD2d). The nuclear spin symmetries and their “para”, “meta” and “ortho” appellations are indicated. The ground-state rotation-inversion transition of ortho-NH3 at 572.5 GHz is only observable from space. The splitting between the inversion doublets of NH3 has been exaggerated for clarity.
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