Abstract
Many peculiarities first observed in the Fulcher bands of the hydrogen molecule can be explained by the interaction of the 3pΠ3 with the 3pΣ3 level. Such peculiarities are: irregular Λ-doublings, perturbations in the 3pΠ3 and 3pΣ3 state, and the absence of P and R branches for large values of the vibrational quantum numbers. This last phenomenon is due to the pre-dissociation of the 3pΠ3 state.

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