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Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 28: Poster: Cold Molecules

MO 28.9: Poster

Thursday, March 11, 2010, 16:00–18:30, Lichthof

Photodissociation and chemical probing spectroscopy of H3+ — •Dennis Bing1, M.H. Berg1, H. Buhr2,1, M. Grieser1, C. Kranz1, M.B. Mendes1, S. Menk1, S. Novotny1, O. Novotný1,3, D.A. Orlov1, A. Petrignani1, R. Repnow1, T. Sorg1, J. Stützel1, X. Urbain4, and A. Wolf11Max-Planck-Institut für Kernphysik, Heidelberg — 2Weizmann Institute of Science, Rehovot, Israel — 3Columbia University, New York, USA — 4Université catholique de Louvain, Louvain-la-Neuve, Belgium

We present developments towards resonantly enhanced multiphoton dissociation (REMPD [1]) spectroscopy on cold H3+ by (a) driving rovibrational excitation from the ground state towards the H3+ dissociation limit near 4.4 eV and (b) establishing single photon dissociation of vibrationally excited H3+ into the channel H2+ + H. Rovibrational excitation spectroscopy of H3+ was performed in a 22-pole RF ion trap, where the ions were cooled down to their lowest rotational states and then excited above the barrier to linearity (E>1.24 eV). Transitions up to the visible range (reaching E>2 eV) were scanned with a cw dye laser. The photodissociation of H3+ was performed separately [2] in a collinear ion-laser-beam setup at the ion storage ring TSR using ion-source-excited H3+ and pulsed Nd:YAG laser harmonics of 266 and 532 nm. An H2+ signal from laser dissociation of stored H3+ ions carrying about 3.4 eV internal excitation was seen with 266 nm and decayed with 1 ms lifetime after the ion beam injection. Combination in a REMPD scheme is coming into reach. [1] B. Roth et al., PRA 74, 040501(R); [2] A. Petrignani et al., J. Phys. Chem. A (submitted).

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