Mixing of the View the D0+u and δ2u ion-pair states of iodine molecule

Abstract

Optical population of the I2(δ2u) state by three-step laser excitation from the ground state X+g via the valence B0+u and 0+g(bb) states correlating with the I(2P3/2) + I(2P1/2) and the I(2P1/2) + I(2P1/2) dissociation limits, respectively, has been observed for the first time. It has been shown that luminescence from the I2(δ2u) state becomes observable due to interaction between the rovibronic levels of the D0+u and δ2u states described by the nonadiabatic operator Vn of the heterogeneous interaction taken in the second order of the perturbation theory where the main intermediate state contribution is provided by the γ1u state.