Abstract
The D2Π1/2-X2Δ3/2 transition of TaO has been analyzed for the first time by recording a laser excitation spectrum of its (0,0) band, which lies near 696 nm. This band was first observed many years ago by Cheetham and Barrow (Trans. Faraday Soc. 63 (1967) 1835–1845), who did not undertake an analysis due to the dense rotational structure. The spectrum displays broad hyperfine structure arising from the 181Ta nucleus that is well resolved at the Doppler-limited resolution of the experiment. The data were fitted using an effective Hamiltonian expressed in a Hund’s case (c) basis, confirming the upper state symmetry as 2Π1/2 and yielding an accurate set of molecular constants describing its rotational and hyperfine structure.
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