Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 11: Kalte Moleküle 2
MO 11.8: Talk
Tuesday, March 3, 2009, 15:45–16:00, VMP 6 HS-G
Rotational and fine-structure resolved fragmentation energies in HF+ reactions with cold electrons — •Julia Stützel1, Oldřich Novotný1, Jens Hoffmann1, Simon Altevogt1, Max H. Berg1, Dennis Bing1, Michael Froese1, Manfred Grieser1, Brandon Jordon-Thaden1, Claude Krantz1, Michael Lange1, Mario Mendes1, Steffen Novotny1, Dimitry A. Orlov1, Annemieke Petrignani1, Sascha Reinhardt2, Tobias Sorg1, Henrik Buhr3, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Max Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1 85748 Garching, Germany — 3Department of Particle Physics, Weizmann Institute of Science , 76100 Rehovot, Israel
The dissociative recombination (DR) of HF+ + e → H(n=2) + F has been investigated at the storage ring TSR. With the HF+ dissociation energy being equal to the binding energy of the H(n=2) product within the rotational energy spread, we were able to resolve for the first time directly the individual rotational levels of HF+ in the fragment energy spectrum of DR (lowest kinetic energy release ∼ 4 meV). For this we measured the projected distance of the neutral fragments on a fragment-imaging detector behind an interaction region with meV electron collisions in merged beams. Modelling the data yielded the electron temperature and provided a highly precise value of the HF+ dissociation energy with an error below 1 meV.