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PERTURBATIONS IN THE ROTATIONAL AND HYPERFINE STRUCTURES OF THE $B^{4}\Pi - X^{4} \Sigma^{-}$ AND $C^{4} \Sigma^{-} -X^{4}\Sigma^{-}$ SYSTEMS OF VO

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/11202

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Title: PERTURBATIONS IN THE ROTATIONAL AND HYPERFINE STRUCTURES OF THE $B^{4}\Pi - X^{4} \Sigma^{-}$ AND $C^{4} \Sigma^{-} -X^{4}\Sigma^{-}$ SYSTEMS OF VO
Creators: Cheung, A. S.- C.; Hocking, W. H.; Lyyra, A. M.; Merer, A. J.; Milton, D. J.
Issue Date: 1980
Abstract: Analyses of the rotational and hyperfine structure have been carried out for various bands of the $B^{4}\Pi - X^{4} \Sigma^{-}$ and $C^{4} \Sigma^{-} -X^{4}\Sigma^{-}$- systems of VO, which lie respectively near 8000 {\AA} and 5700 {\AA}. All the bands of both systems are perturbed, with some quite sizeable avoided crossings occurring in the levels of the $B^{4}\Pi$ state. The available evidence indicates that the principal perturbing state is another $^{4}\Sigma^{-}$ state. Hyperfine structure due to the vanadium nucleus (I=7/2) is resolved in branches involving the $F_{1}$ and $F_{4}$ electron spin components of the ground state. The determination of accurate rotational constants for the ground state is greatly complicated by internal $hyperfine^{1}$ perturbations caused by $\Delta=0, \Delta=0, \Delta=\pm 1$ matrix elements of the hyperfine Hamiltonian, centred round N=15; similar internal perturbations also occur in the $C^{4}\Sigma^{-}$ state near N = 5. These are currently being studied by high-resolution laser-induced fluorescence methods.
URI: http://hdl.handle.net/1811/11202
Other Identifiers: 1980-MF-2
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