Author:
Horani M.,Rostas J.,Lefebvre-Brion H.
Abstract
A semi-empirical calculation of the fine structure of the 3Σ− ground states of several diatomic hydrides gives results in very good agreement with experiment. The Λ doubling of the 3Π0 first excited state, for J = 0, is shown to result from the algebraic sum of the spin–spin contribution and the spin–orbit interaction with Σ states. For the NH radical, the former effect predominates. For heavier molecules, the spin–orbit contribution dominates and the sign of the Λ doubling is reversed.The positions of the 3Π rotational levels do not agree with Gilbert's formulae. The apparent shift is interpreted by a simple model. In addition to the perturbation by the lower lying 3Σ− and 1Σ+ states and by a higher lying 1Π state, one must take into account perturbation by the lower lying 1Δ state. The values of the parameters obtained from fitting the experimental data support this interpretation.
Publisher
Canadian Science Publishing
Subject
General Physics and Astronomy
Cited by
62 articles.
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