Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 8: Posters Thursday: Dissociation and other Collision Processes

MO 8.8: Poster

Thursday, April 5, 2001, 12:30–15:00, AT3

Resonant Ion-Pair Formation of HD⁺, NO⁺ and H₃⁺ — •Anita Neau¹, Wei Zong¹, Asa Larson¹, Nada Djuric², Arnaud Le Padellec³, Ahmed Al-Khalili¹, Hakan Danared⁴, Alik M. Derkatch¹, Chris H. Greene², Ann E. Orel⁵, Duska Popovic², Stefan Rosen¹, Jacek Semaniak⁶, Wei Shi¹, Richard Thomas¹, Ljiljana Vikor¹, Magnus af Ugglas⁴, Mats Larsson¹, and Gordon H. Dunn² — ¹Department of Physics, Stockholm University, Box 6730, S-113 85 Stockholm, Sweden — ²JILA and Department of Physics, University of Colorado and NIST, Boulder, Colorado 80309-0440 — ³LCAR UMR 5589 Universite Paul Sabatier-Toulouse III, 31062 Toulouse Cedex, France — ⁴Manne Siegbahn Laboratory, S-104 05 Stockholm, Sweden — ⁵Department of Applied Science, University of California, Davis, Livermore, California 94550 — ⁶Institute of Physics, Pedagogical University, 25-406 Kielce, Poland

The capture of an electron by a molecular ion can be stabilized by fast dissociation. If the produced fragments are a pair of positive and negative fragments, this process is called resonant ion pair formation. Here we present experimental studies of this process for HD⁺, NO⁺ and H₃⁺. The experiments were performed at the ion storage ring CRYRING, MSL, Stockholm, by detecting negative fragments arising from the dissociations. For HD⁺, 14 peaks were observed in the measured cross sections. For NO⁺, results were compared with photoionization data. Results for H₃⁺ were still in progress at the time this abstract was written.