Frankfurt 2006 – scientific programme
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MO: Molekülphysik
MO 55: Poster: Collisions and Energy Transfer
MO 55.8: Poster
Thursday, March 16, 2006, 16:30–18:30, Labsaal
Dissociative recombination of H3+: evidence for nuclear spin effects — •Holger Kreckel1, Michael Motsch1, Jochen Mikosch1,2, Juraj Glosik3, Radek Plasil3, Simon Altevogt1, Vola Andrianarijaona1, Henrik Buhr1, Jens Hoffmann1, Lutz Lammich1, Michael Lestinsky1, Iftach Nevo4, Steffen Novotny1, Dmitry A. Orlov1, Henrik B. Pedersen1, Frank Sprenger1, Jonathan Toker4, Roland Wester2, Dieter Gerlich5, Dirk Schwalm1, Andreas Wolf1, and Daniel Zajfman1,4 — 1Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany — 2Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany — 3Faculty of Mathematics and Physics, Charles University Prague, Czech Republic — 4Department of Particle Physics, Weizmann Institute of Science, Rehovot, 76100, Israel — 5Institut für Physik, Technische Universität, 09107 Chemnitz, Germany
The dissociative recombination (DR) of H3+ is one of the most important processes in the chemical networks of cold interstellar clouds, and still subject to a long-standing controversy regarding its rate coefficient at Kelvin temperatures.
We have performed a high resolution H3+ DR measurement at the TSR storage ring, employing a cryogenic 22-pole ion trap at 13 K to precool the ions by buffer gas collisions to their two lowest rotational states. To lower the transversal electron temperature to 6 K and improve the resolution, a new photocathode electron source in the TSR electron target has been applied. Furthermore first evidence for a nuclear spin effect in the DR process was found by using para-H2 gas in the ion source.