Abstract
The rotational spectra of NiF in the electronic ground 2Π state and the lowest electronically excited 2Σ state have been observed. The source of nickel atom was sputtering from a nickel electrode or nickel powder placed on a stainless steel electrode. The molecular constants have been determined by a least-squares analysis of the observed transition frequencies. The rapid increase in the Λ-type splittings in the ground state reveals that the observed rotational transitions are ascribed to the spin substate 2Π3/2. The rotational transitions corresponding to the other substate,2Π1/2, have not been observed. The large spin–rotation interaction constant γ in the electronically excited 2Σ state is consistent with that from the electronic spectroscopy.
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