Abstract
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 (ab) state, were studied using vibrationally resolved luminescence spectra corresponding to transitions from δ2u(3P2) and 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 → (ab) transitions are found to exponentially decrease.
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