Abstract
We have analyzed the 1u(1D) and 2u(1D) ion-pair states of I2 by perturbation-facilitated optical–optical double resonance using the B3Π(0u+)∼c1g mixing state as an intermediate. The double-resonance spectra exhibited the strong vibrational progression to the 1u(1D) state in accord with the ΔΩ=0 propensity rule for the valence to ion-pair state transitions. With the state selection in the intermediate state, each progression shows a simple rotational structure consisting of P and R doublets, while the extra lines were found in some vibrational states. We interpreted the occurrence of the extra lines as the interaction with the 2u(1D) state lying closely and extended our observation to its lower vibrational states. Finally we identified the 1u(1D) state in the 0≤v≤31 range and the 2u(1D) state in the 0≤v≤9 range, and analyzed their energy levels including the heterogenous interaction. The 1u(1D)–2u(1D) interaction was found to be described in the pure precession approximation and the precious molecular constants were reported for the 1u(1D) and 2u(1D) ion-pair states.
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