title: Communication: Visible line intensities of the triatomic hydrogen ion from experiment and theory.
abstract: The visible spectrum of H3(+) is studied using high-sensitivity action spectroscopy in a cryogenic radiofrequency multipole trap. Advances are made to measure the weak ro-vibrational transitions from the lowest rotational states of H3(+) up to high excitation energies providing visible line intensities and, after normalisation to an infrared calibration line, the corresponding Einstein B coefficients. Ab initio predictions for the Einstein B coefficients are obtained from a highly precise dipole moment surface of H3(+) and found to be in excellent agreement, even in the region where states have been classified as chaotic.
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
authors.forename: Annemieke
authors.initials: A
authors.lastname: Petrignani
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
authors.forename: Max H
authors.initials: MH
authors.lastname: Berg
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Grussie
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Wolf
authors.affiliation: Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhnii Novgorod 603950, Russia.
authors.forename: Irina I
authors.initials: II
authors.lastname: Mizus
authors.affiliation: Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhnii Novgorod 603950, Russia.
authors.forename: Oleg L
authors.initials: OL
authors.lastname: Polyansky
authors.affiliation: Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Tennyson
authors.affiliation: Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhnii Novgorod 603950, Russia.
authors.forename: Nikolai F
authors.initials: NF
authors.lastname: Zobov
authors.affiliation: Department of Chemistry, Rutgers University, Newark, New Jersey 07102, USA.
authors.forename: Michele
authors.initials: M
authors.lastname: Pavanello
authors.affiliation: Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: Ludwik
authors.initials: L
authors.lastname: Adamowicz