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Molecular parameters for weakly bound 2g(aa, ab) and 0 u − ( a b ) states of molecular iodine and dipole moment functions of transitions to these states

Weakly bound valence states of 2g symmetry, correlating with the I(2P3/2) + I(2P3/2) (aa) and I(2P3/2) + I(2P1/2) (ab) dissociation limits, as well as 0 u − (ab) state, were studied using vibrationally resolved luminescence spectra corresponding to transitions from δ2u(3P2) and g 0 g − (3P1) ion-pair states, in molecular iodine, respectively, populated using a three-step three-color laser excitation scheme. Spectroscopic constants and potential energy curves of the valence states are determined for the first time. Dipole moment functions of δ2u → 2g(aa, ab) and g 0 g − → 0 u − (ab) transitions are found to exponentially decrease.