Observation of a substantially-bound excited-core Rydberg state in I2 by optical triple resonance

Predissociation Dynamics of Br2 in the [2Π1/2]c5d; 0g + and [2Π3/2]c6d; 0g + Rydberg States by Velocity Map Imaging Study

We investigated the predissociation dynamics from the [²Π_1/2]_c5d; 0_g ⁺ and [²Π_3/2]_c6d; 0_g ⁺ Rydberg states of Br₂ using the velocity map imaging technique. Two-dimensional scattering images of the fragmented Br⁺ exhibited an isotropic feature upon the excitation of these Rydberg states. Analysis of the total kinetic energy release suggested the existence of the predissociation pathways to the dissociation limits of Br(5s, ⁴P_3/2) + Br(4p, ²P_3/2) and Br(5s, ⁴P_5/2) + Br(4p, ²P_3/2) via the 0_g ⁺ ion-pair states that interact with the lower and/or excited-core Rydberg states lying at long internuclear distance regions thorough the avoided crossing.