Electron-impact excitation of multicharged ions: Merged beams experiments
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)
- Department of Physics, Chungnam National University, Gung-Dong 220, 3005-764 Daejon, South (Korea)
- JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440 (United States)
- Department of Physics and Astronomy, University College London, London WC1E 6BT (United Kingdom)
- Department of Physics, St. Francis Xavier University, Antigonish, Nova Scotia, Canada, B2G 2W5 (CANADA)
Electron-impact excitation cross sections for several multicharged ions have been measured near threshold using the merged electron-ion beams energy loss (MEIBEL) technique. This technique allows the investigation of optically-allowed and forbidden transitions with sufficient energy resolution, typically about 0.2 eV, to resolve resonance structures in the cross sections. Results from the JILA/ORNL MEIBEL experiment on allowed transitions in several multicharged ions demonstrate the ability of various theoretical methods to predict cross sections in the absence of resonances. Comparisons of R-matrix calculations and measured cross sections for transitions in Mg-like Si{sup 2+} and Ar{sup 6+}, however, indicate that theory must continue to evolve in order to more accurately predict cross sections involving significant contributions from dielectronic resonances and interactions between neighboring resonances. {copyright} {ital 1999 American Institute of Physics.}
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-96OR22464; AI02-95ER54293
- OSTI ID:
- 686400
- Report Number(s):
- CONF-981122-; ISSN 0094-243X; TRN: 99:010105
- Journal Information:
- AIP Conference Proceedings, Vol. 475, Issue 1; Conference: 15. international conference on the application of accelerators in research and industry, Denton, TX (United States), 4-7 Nov 1998; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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