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
Loading...
Date
1980
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
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.
Description
$^{1}$D. Richards and R.F. Barrow, Nature, 219, 1244 (1968).
Author Institution:
Author Institution: