title: Heterogeneous and hyperfine interactions between valence states of molecular iodine correlating with the I((2)P1/2) + I((2)P1/2) dissociation limit.
abstract: Detailed analysis of interactions between all 0g (+), 1u, and 0u (-) weakly bound states of iodine molecule correlating with the I((2)P1/2) + I((2)P1/2) (bb) dissociation limit has been performed. For this purpose, the 0u (-) (bb) state has been described using analysis of rotationally resolved excitation spectra of luminescence from the g0g (-) state populated in a three-step three-color perturbation facilitated excitation scheme via the 0u (-) state. Energies of 41 rovibrational levels, molecular constants, and potential energy curve have been determined. Energy gaps between closest rovibrational levels of the 0u (-) and 0g (+), 1u (bb) states are found to be large, ∼6 cm(-1). However, interaction of all three 0g (+), 1u, and 0u (-) (bb) states has been observed. It has been found that the 0u (-) and 1u electronic states are mixed by heterogeneous interactions, while their mixing with the 0g (+) one is due to hyperfine interactions predominantly. Admixture coefficients and electronic matrix elements of the coupling between the 0g (+) ∼1u, 0g (+)∼0u (-), and 0u (-) ∼1u states have been estimated.
authors.affiliation: Department of Physics, Saint-Petersburg State University, SPbU, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russia.
authors.forename: Vera V
authors.initials: VV
authors.lastname: Baturo
authors.affiliation: Department of Physics, Saint-Petersburg State University, SPbU, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russia.
authors.forename: Igor N
authors.initials: IN
authors.lastname: Cherepanov
authors.affiliation: Department of Physics, Saint-Petersburg State University, SPbU, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russia.
authors.forename: Sergey S
authors.initials: SS
authors.lastname: Lukashov
authors.affiliation: Department of Physics, Saint-Petersburg State University, SPbU, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russia.
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Poretsky
authors.affiliation: Department of Physics, Saint-Petersburg State University, SPbU, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russia.
authors.forename: Anatoly M
authors.initials: AM
authors.lastname: Pravilov
authors.affiliation: Department of Physics, Saint-Petersburg State University, SPbU, 7/9 Universitetskaya Nab., St. Petersburg 199034, Russia.
authors.forename: Anatoly I
authors.initials: AI
authors.lastname: Zhironkin