Abstract
The rotational spectrum of NiD in the lowest three vibrational levels (v = 0, 1, 2) of its ground 2Δ state has been studied by far-infrared laser magnetic resonance (LMR). Transitions have been detected for all five isotopes of nickel and within both the lower 2Δ5/2 and upper 2Δ3/2 spin components. The nuclear hyperfine splittings for the 61Ni isotope (I = 3/2) have been resolved. An effective Hamiltonian has been used to fit the data which include the known vibration-rotational transitions within the 2Δ5/2(v = 1 ← v = 0) subsystem and a fine structure transition in the v = 0 level of the 2Δ ground state, recently measured by CO2 LMR. From a parity splitting of the rotational transition within the X 2Δ3/2 spin component we have determined the first Λ-type doubling parameter for the X 2Δ ground state. A set of molecular parameters for NiD in the 2Δ ground state of NiD is given which allows a comparison with the parameter set for the well known NiH radical.
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