Effects of molecular rotation in low-energy electron collisions of H 3+

Andreas Wolf*, H. Kreckel, L. Lammich, D. Strasser, J. Mikosch, J. Glosík, R. Plašil, S. Altevogt, V. Andrianarijaona, H. Buhr, J. Hoffmann, M. Lestinsky, I. Nevo, S. Novotny, D. A. Orlov, H. B. Pedersen, A. S. Terekhov, J. Toker, R. Wester, D. GerlichD. Schwalm, D. Zajfman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Measurements on the energetic structure of the dissociative recombination rate coefficient in the millielectronvolt range are described for H 3+ ions produced in the lowest rotational levels by collisional cooling and stored as a fast beam in the magnetic storage ring TSR (Test Storage Ring). The observed resonant structure is consistent with that found previously at the storage ring facility CRYRING in Stockholm, Sweden; theoretical predictions yield good agreement on the overall size of the rate coefficient, but do not reproduce the detailed structure. First studies on the nuclear spin symmetry influencing the lowest level populations show a small effect different from the theoretical predictions. Heating processes in the residual gas and by collisions with energetic electrons, as well as cooling owing to interaction with cold electrons, were observed in long-time storage experiments, using the low-energy dissociative recombination rate coefficient as a probe, and their consistency with the recent cold H3+ measurements is discussed.

Original languageAmerican English
Pages (from-to)2981-2997
Number of pages17
JournalPhilosophical transactions. Series A, Mathematical, physical, and engineering sciences
Volume364
Issue number1848
DOIs
StatePublished - 15 Nov 2006
Externally publishedYes

Keywords

  • Collisional heating and cooling of rotations
  • Dissociative recombination
  • Low-energy resonances

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