The orange system of ScO has been reanalyzed as a 2Π → 2Σ transition. We have observed all the branches which are compatible with the selection rules ΔJ = 0, ± 1. We have not detected the hyperfine structure in the excited state, the coupling case being therefore aβ. The magnetic hyperfine interaction inducing the ground state doubling is the only one which appears; it has been analyzed by other authors who have shown that the coupling case for this state is of the type bβS.The use of an alloy hollow-cathode lamp, cooled with liquid nitrogen, has enabled us to improve the frequency measurements. The values of the constants have been obtained by a method by which, working directly with the Hamiltonian, the introduction of each parameter can be justified. The study of the Λ doubling in 2Π3/2 and 2Π1/2 levels leads us to values of ξ and η very close to those predicted for a pure precession case.
Rotational analysis of 20 selected bands from the electronic spectrum of the LuF molecule has been carried out. No perturbation was detected; the molecular constants deduced from a 'direct approach' including all the bands are given for the fundamental state X1Σ (ωe = 611.79, Be = 0.26764) and the excited states A1Σ (ωe = 587.95, Be = 0.26356), B1Π (ωe = 581.3, Be = 0.2632), E1Π (ωe = 543.42, Be = 0.25647), and F1Σ (ωe = 560.8, Be = 0.25815).
From new spectra and by the use of a better computation procedure it has been possible to improve the rotational analysis of the (0,0) band of the red system of TiN. In particular, the spin doubling of the lower 2Σ state has been resolved and two new perturbations have been identified in the 2Π state. The inclusion of high values of J yields more accurate molecular constants.
A detailed study of hyperfine structure observed in the 0,0 band of the 3<1>( ap)-.3.6.( ap) system of NbN has shown that the secondary hyperfine effects observed in this structure are not due to a perturbation in the 3.6. state but rather to the presence of a nonnegligible hyperfine effect in the 3<1> excited state. Calculations of the intensity factors corresponding to the observed transitions confirm this hypothesis and give results in excellent agreement with experiment.As a result of this, together with the fact that the ratio of the linewidths in the 3~4-3.1.3 and 3~2-3.1.1 subbands is too low when compared with the theoretical value, it is necessary to examine the various possible· theoretical models to explain all of the effects observed.
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