Fig. 3
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.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.