Session FTP1: Poster Session I (19:00-21:30)

7:00 PM–7:00 PM, Tuesday, October 14, 2008
Room: Salon F-J

Chair: I. Langmuir

Abstract ID: BAPS.2008.GEC.FTP1.100

Abstract: FTP1.00100 : Fragmentation studies of CF$^+$ and HF$^+$ ions in collisions with cold electrons

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Authors:

  Oldrich Novotny
  S. Altevogt
  M.H. Berg
  D. Bing
  H. Buhr
  H. Fadil
  M. Froese
  J. Hoffmann
  B. Jordon-Thaden
  C. Krantz
  M. Lange
  M. Lestinsky
  M. Mendes
  S. Novotny
  D.A. Orlov
  A. Petrignani
  A. Shornikov
  T. Sorg
  J. Stuetzel
  A. Wolf
    (Max-Planck-Institut f\"ur Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany)

  A.S. Jaroshevich
    (Institute of Semiconductor Physics, 630090 Novosibirsk, Russia )

The fundamental molecules composed of atoms from the second row of the periodic table (C,N,O,F) have a rich structure of excited potential curves that can be probed at high energy resolution by observing fragmentation processes following collisions with quasi-monochromatic electrons. Experiments of this type are performed in merged electron and ion beams at the ion storage ring TSR in Heidelberg, Germany. Using a cold, photocathode-produced electron beam, experiments on the system CF$^+$ yield rich structure in the collision energy dependence of both dissociative recombination (DR) and excitation (DE). The fragment-imaging technique shows a strong collision energy dependence of final ground and excited states of DR products. Moreover, an angular anisotropy of DR is observed for elevated collision energies. DR of HF$^+$ displays extremely low kinetic energy release of neutral fragments yielding resolution on initial rotational states of the ions. This predestines HF$^+$ to be used as ``molecular thermometer.''

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.GEC.FTP1.100