Abstract
Abstract We used the perturbation-facilitated optical–optical double resonance technique to access the ungerade ion-pair states of I2 using the (1 + 1) photo-excitation sequence through the B3Π(0u+)–c1g parity mixing states. By analyzing the second step of the double resonance to the F0u+(3P0), γ1u(3P2), and H1u(3P1) states, the g–u coupling schemes were elucidated in the intermediate B3Π(0u+)–c1g state. We were also able to populate the δ2u(3P2) state through the g–u mixing state, and to improve its molecular constants. The interference effect between the parallel γ1u(3P2)–c1g and perpendicular δ2u(3P2)–c1g transitions was used to derive the ratio of their electronic transition moments, (μ||e/μ⊥e) ∼ 5.5.
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