The new features in the hyperfine spectrum of ${\mathrm{N}}^{14}$${\mathrm{H}}_3$ described in the preceding paper are shown to be due to the interactions of the magnetic moments of the three protons with the molecular magnetic field caused by rotation and with the magnetic moment of the ${\mathrm{N}}^{14}$ nucleus. Since the protons are off the molecular symmetry axis, these interactions are of a form different from that usually encountered. They possess matrix elements connecting states differing by two units in symmetric top quantum number $K$ and are capable, therefore, of lifting the degeneracy between states for which $K=-1\mathrm{}$ and $K=1\mathrm{}$. A systematic treatment of the problem of the hyperfine interactions in this molecule has been made in order to find any other effects detectable with present equipment.

• Received 28 December 1953

DOI:https://doi.org/10.1103/PhysRev.94.1191