title: Fundamental excitations of the shared proton in the H3O2- and H5O2+ complexes.
abstract: We exploit recent advances in argon predissociation spectroscopy to record the spectroscopic signature of the shared proton oscillations in the H3O2- system and compare the resulting spectrum with that of the H5O2+ ion taken under similar conditions. Very intense 1 <-- 0 transitions are observed below 1100 cm(-1) in both cases and are surprisingly sharp, with the 697 cm(-1) transition in H3O2- being among the lowest in energy of any shared proton system measured to date. The assignments of the three fundamental transitions associated with the three-dimensional confinement of the shared proton in H3O2- are carried out with full-dimensional (DMC) calculations to treat this strongly anharmonic vibrational problem.
authors.forename: Eric G
authors.initials: EG
authors.lastname: Diken
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Headrick
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Roscioli
authors.forename: Joseph C
authors.initials: JC
authors.lastname: Bopp
authors.forename: Mark A
authors.initials: MA
authors.lastname: Johnson
authors.forename: Anne B
authors.initials: AB
authors.lastname: McCoy