Theoretical Study of the Hyperfine Structure in the Inversion Spectra of the Deutero-Ammonias

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Abstract
The energy splittings in the inversion spectra of N14D3, N14HD2, and N14DH2 caused by nitrogen and deuteron quadrupole interactions with the molecular electric field, the interactions of the nuclear spins with the molecular magnetic field, and the spin‐spin interactions are found. The molecular coupling scheme of Van Vleck is used to treat the Hamiltonian to second order in the electronic energies. Group theory is used to select wave functions which simplify the solution of the secular equations. For N14D3 thirteen constants appear in the energy expressions. Order of magnitude estimates for eleven of these constants can be made using data from the experimental work on N14H3. No estimate is made of the deuteron quadrupole coupling constants. With N14HD2 and N14DH2 twenty‐four constants appear in each case. Order of magnitude estimates can be made for only nine of these.