Spectroscopic observation and characterization of H(+)H(-) heavy Rydberg states

The Journal of Physical Chemistry. a
M O VieitezW Ubachs

Abstract

A series of discrete resonances was observed in the spectrum of H2, which can be unambiguously assigned to bound quantum states in the 1/R Coulombic potential of the H+H- ion-pair system. Two-step laser excitation was performed, using tunable extreme ultraviolet radiation at lambda = 94-96 nm in the first step, and tunable ultraviolet radiation in the range lambda = 310-350 nm in the second step. The resonances, detected via H+ and H2+ ions produced in the decay process, follow a sequence of principal quantum numbers (n = 140-230) associated with a Rydberg formula in which the Rydberg constant is mass scaled. The series converges upon the ionic H+H- dissociation threshold. This limit can be calculated without further assumptions from known ionization and dissociation energies in the hydrogen system and the electronegativity of the hydrogen atom. A possible excitation mechanism is discussed in terms of a complex resonance. Detailed measurements are performed to unravel and quantify the decay of the heavy Rydberg states into molecular H2+ ions, as well as into atomic fragments, both H(n = 2) and H(n = 3). Lifetimes are found to scale as n3.

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Jul 16, 2008·The Journal of Physical Chemistry. a·Trevor RidleyEoin Lane
Nov 13, 2008·Physical Review Letters·M O VieitezW Ubachs

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Citations

Oct 5, 2010·The Journal of Chemical Physics·Adam Kirrander
May 10, 2011·The Journal of Chemical Physics·C O ReinholdF B Dunning
Jun 24, 2014·The Journal of Chemical Physics·C H WangF B Dunning
Jun 1, 2015·The Journal of Chemical Physics·Robert J DonovanTrevor Ridley
Oct 16, 2018·Faraday Discussions·Adam KirranderKenneth P Lawley
Jul 25, 2018·The Journal of Chemical Physics·Maximilian Beyer, Frédéric Merkt

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