Abstract
Diatomic nickel boride, NiB, has been produced in a laser ablation molecular jet source. Survey spectra, taken at medium resolution with a pulsed dye laser in the 415–510nm region, showed an intense band system which had previously been observed and assigned as a 2Π3/2–2Σ+ transition by Zhen et al. (2010). Using a single frequency ring dye laser, we have obtained high resolution spectra of the 0–0, 2–0 and 3–0 bands of the most abundant isotopologue, 58Ni11B, and also the 2–0 band of 60Ni11B. The rotational analysis showed that the transition was from an Ω=0.5 upper state to the ground X2Σ+ state. The data were found to fit equally well as 2Σ+–2Σ+ or 2Π1/2–2Σ+. The fine structure in the upper state was examined for each of the two options and suggested that the e/f parity splitting is best described by the Λ-doubling parameter, p, of a 2Π1/2 state. Analysis of partially resolved hyperfine structure due to the 11B nuclear spin, I=3/2, indicated that the 2pσ orbital from the ground 2P1/2 state of the boron atom makes a significant contribution to the ground 2Σ+ state configuration of NiB.
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