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MO: Molekülphysik

MO 8: Posters Thursday: Dissociation and other Collision Processes

MO 8.15: Poster

Thursday, April 5, 2001, 12:30–15:00, AT3

Dissociative recombination and excitation of H₃⁺ — •Marie J. Jensen¹, Henrik B. Pedersen², C. P. Safvan¹, Klaus Seiersen¹, Xavier Urbain³, and Lars H. Andersen¹ — ¹Institute of Physics and Astronomy, University of Aarhus, DK-8000 Århus C, Denmark — ²Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel — ³Départment de Physique, Université Catholique de Louvain, B1348, Louvain-la-Neuve, Belgium

Using the ASTRID heavy-ion storage ring, absolute cross sections for dissociative recombination and dissociative excitation of vibrationally cold H₃⁺ have been measured as a function of energy in the region E=0−34 eV. A thermal rate coefficient for dissociative recombination of (1.0±0.2)·10⁻⁷ cm³s⁻¹ at 300 K has been derived from cross sections at low energy. At high energy, capture into a group of doubly-excited states of H₃ gives rise to resonances in the dissociative recombination as well as in the dissociative excitation cross sections.