Dissociative recombination and excitation of H-3(+) - art. no. 052701

Using the ASTRID heavy-ion storage ring, absolute cross sections for dissoc iative recombination and dissociative excitation of vibrationally cold H-3( +) have been measured as a function of energy in the region E=0-34 eV. A th ermal rate coefficient for dissociative recombination of (1.0 +/- 0.2) x 10 (-7) cm(3) s(-1) at 300 K was obtained from cross sections at low energy. A t high energy, capture into a group of doubly excited states of H-3 gives r ise to resonances in the dissociative recombination as well as in the disso ciative excitation cross sections.