Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 17: Collision processes and energy transfer I (jointly with MO)
A 17.6: Talk
Thursday, March 13, 2008, 10:00–10:15, 3F
Dissociative recombination of the lowest rotational states of H3+ — •Annemieke Petrignani1, Holger Kreckel2, Max H. Berg1, Simon Altevogt1, Dennis Bing1, Henrik Buhr3, Michael Froese1, Jens Hoffmann1, Brandon Jordon-Thaden1, Claude Krantz1, Mario B. Mendes1, Oldrich Novotný1, Steffen Novotny1, Dmitry A. Orlov1, Sascha Reinhardt1, Tobias M. Sorg1, Julia Stützel1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Columbia University, 550 West 120th Street, New York, NY 10027, USA — 3Department of Particle Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
The dissociative recombination (DR) of the lowest rotational states of H3+ have been investigated at the storage ring TSR using a cryogenic 22-pole radiofrequency ion trap as injector. The H3+ was cooled through buffer gas at ∼15K to the two lowest rotational levels, (J,G)=(1,0) and (1,1), of the ortho and para proton-spin symmetries. New high-statistics scans of the DR with a photocathode electron source reveal resonances at electron energies down to the 1-10 meV range with ∼0.5-1.5 meV collision-energy resolution. The effect of rotational heating is demonstrated by comparing to the rate of a hot H3+ beam from a Penning source. Additionally, the reaction dynamics of the 2-body and 3-body break-up for low collision energies were investigated. Comparisons were made using normal- and pure para-H2 in the cold injection source.