Abstract
The b3 Pi g-a3 Sigma u+ emission transition has been photographed, at high resolution, in the near infra-red region. The rotational structure of eight bands has been analysed and the molecular constants of the two states have been determined. Small perturbations have been observed in the b3 Pi g regular state. The perturbing state has been identified as a 5 Sigma g+ state. The deperturbation has been carried out. The perturbation parameter of the 3 Pi -5 Sigma interaction and the molecular constants of this new quintuplet state are given.

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