title: Adiabatic ab initio study of the BaH(+) ion including high energy excited states.
abstract: An adiabatic study of 1-34 (1,3)Σ(+) electronic states of barium hydride ion (BaH(+)) is presented for all states dissociating below the ionic limit Ba(2+)H(-). The 1-20 (1,3)Π and 1-12 (1,3)Δ states have been also investigated. In our approach, the valence electrons of the Ba(2+) ion described by an effective core potential (ECP) and core polarization potential (CPP) with l-dependent cutoff functions have been used. The ionic molecule BaH(+) has been treated as a two-electron system, and the full valence configuration interaction (CI) is easily achieved. The spectroscopic constants Re, De, Te, ωe, ωexe, and Be are derived. In addition, vibrational level spacing and permanent and transition dipole moments are determined and analyzed. Unusual potential shapes are found and also accidental quasidegeneracy in the vibrational spacing progression for various excited states. The (1)Σ(+) states exhibit ionic charge transfer avoided crossings series which could lead to neutralization or even H(-) formation in collisions of H(+) with Ba.
authors.affiliation: Laboratoire de Physique Quantique, Faculté des Sciences de Monastir, Université de Monastir , Avenue de l'Environnement 5019, Monastir, Tunisia.
authors.forename: Leila
authors.initials: L
authors.lastname: Mejrissi
authors.forename: Héla
authors.initials: H
authors.lastname: Habli
authors.forename: Houcine
authors.initials: H
authors.lastname: Ghalla
authors.forename: Brahim
authors.initials: B
authors.lastname: Oujia
authors.forename: Florent Xavier
authors.initials: FX
authors.lastname: Gadéa