Low-lying resonances in electron-neon scattering: Measurements at 4-meV resolution and comparison with theory
- Fachbereich Physik, Technische Universitaet Kaiserslautern, D-67653 Kaiserslautern (Germany)
- Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States)
An electron scattering apparatus, combining a laser photoelectron source, a triply differentially pumped supersonic beam target, and several electron multipliers for simultaneous detection of elastically scattered electrons and of metastable atoms due to inelastic scattering, has been used for an improved study of electron-neon scattering over the energy range 16-19 eV at experimental energy widths of 4-6 meV. Accurate values for the energies and widths of the low-lying Ne{sup -}(2p{sup 5}3s{sup 2} {sup 2}P{sub 3/2,1/2}) Feshbach resonances have been determined from detailed analyses of the resonance profiles (measured at the five scattering angles 22.5 deg., 45 deg., 90 deg., 112.5 deg., 135 deg.). In addition, the excitation function for the production of metastable Ne*(2p{sup 5}3s {sup 3}P{sub 2,0}) atoms has been measured from threshold to 19 eV; from a fit to its onset, the absolute electron energy scale is established to better than 0.5 meV. While our resonance widths agree with the recommended values, the resonance energies differ by an amount larger than the quoted respective uncertainties. The experimental data are also compared with theoretical results, calculated with an improved R-matrix approach. Very good overall agreement between the experimental and the theoretical results is observed. A very sharp Feshbach resonance, associated with the Ne*(2p{sup 5}3p[5/2]{sub 2}) level, has been theoretically predicted and experimentally confirmed at 18.527 eV.
- OSTI ID:
- 20650233
- Journal Information:
- Physical Review. A, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevA.71.012704; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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