Hyperfine interactions in homonuclear diatomic molecules and u-g perturbations. II. Experiments on I2

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Abstract
The iodine B 0+u state is studied near its dissociation limit using sub-Doppler high resolution techniques. The recording of more than 10 000 hyperfine lines allows a systematic analysis of the hyperfine structure. All the observed features can be accounted for by the calculation of the interactions of the B state with the other electronic states sharing the same dissociation limit. Three different situations are encountered : weak perturbation situations treated in the second-order approximation of the Broyer, Vigué, Lehmann theory, superhyperfine structures observed in several band heads, and strong perturbation cases (vibrational levels ν' = 76, 77 and 78). This last situation has required the utilization of the full exact interaction matrix of B 0+u with a 1 g state, leading to the first direct evidence of a u-g symmetry breaking in a homonuclear diatomic molecule