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Electron impact single detachment on the F - ions using the heavy ion storage ring CRYRING: Cross-section determination |
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| Authors: | K Andersson D Hanstorp A Neau S Rosén HT Schmidt R Thomas M Larsson J Semaniak F Österdahl H Danared A Källberg A Le Padellec |
| Institution: | Department of Physics, Chalmers University of Technology/G?teborg University, 412 96 G?teborg, Sweden, SE Department of Physics, Stockholm University, Box 6730, 113 85 Stockholm, Sweden, SE Institute of Physics, Pedagogical University, 25-405 Kielce, Poland, PL Manne Siegbahn Laboratory, Frescativ?gen 24, 104 05 Stockholm, Sweden, SE LCAR, Université Paul Sabatier-Toulouse III, 118 route de Narbonne, batiment III R1B4, 31062 Toulouse Cedex 4, France, FR |
| Abstract: | Electron Impact Single Detachment (EISD) of F- has been studied using the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory, Stockholm, Sweden. F- ions stored in the ring were merged with an electron beam in one of the ring sections. Neutral F atoms produced in the EISD process were detected in the zero-degree direction using a surface barrier detector. The threshold for the detachment process was found to be around 7.6 eV, thus more than twice the binding energy of F-. The cross-sections increased smoothly up to 55 eV where it reached a maximum of 1.9×10 -16 cm 2 . At higher energies a slow decrease of the cross-section was observed, which follows the energy dependence predicted by the Bethe-Born approximation. The experiment showed that CRYRING can be used favourably for studies of anions, and several experiments are forthcoming. Received 14 June 2000 and Received in final form 11 September 2000 |
| Keywords: | PACS 34 80 Dp Atomic excitation and ionization by electron impact – 32 10 Hq Ionization potentials electron affinities |
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