Recent experiments on near-threshold electron-impact excitation of multiply charged ions

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Some recent measurements of excitation of multiply charged ions by electrons studied in beam-beam experiments are highlighted. The emphasis is on absolute total cross sections measured with the merged electron-ion beams energy-loss (MEIBEL) technique, although some results obtained with the crossed-beams fluorescence method are also presented. The MEIBEL 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 dipole-allowed transitions in several ions demonstrate the success of various theoretical methods in predicting cross sections in the absence of ... continued below

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13 p.

Creation Information

Bannister, M.E.; Djuric, N.; Woitke, O.; Dunn, G.H.; Chung, Y.S.; Smith, A.C.H. et al. April 1, 1998.

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  • Bannister, M.E. Oak Ridge National Lab., TN (United States). Physics Div.
  • Djuric, N.
  • Woitke, O.
  • Dunn, G.H. National Inst. of Standards and Technology, Boulder, CO (United States)
  • Chung, Y.S. Chungnam National Univ., Daejon (Korea, Republic of). Dept. of Physics
  • Smith, A.C.H. University Coll. London (United Kingdom). Dept. of Physics and Astronomy
  • Wallbank, B. St. Francis Zavier Univ., Antigonish, Nova Scotia (Canada). Dept. of Physics

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Description

Some recent measurements of excitation of multiply charged ions by electrons studied in beam-beam experiments are highlighted. The emphasis is on absolute total cross sections measured with the merged electron-ion beams energy-loss (MEIBEL) technique, although some results obtained with the crossed-beams fluorescence method are also presented. The MEIBEL 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 dipole-allowed transitions in several ions demonstrate the success of various theoretical methods in predicting cross sections in the absence of resonances. Comparisons of R-matrix calculations and measured cross sections for spin-forbidden transitions in Mg-like Si{sup 2+} and Ar{sup 6+}, however, show that further refinements to the theory are needed in order to more accurately predict cross sections involving significant contributions from dielectric resonance`s and interactions between neighboring resonances.

Physical Description

13 p.

Notes

INIS; OSTI as DE98004882

Source

  • 11. APS topical conference on atomic processes in plasmas, Auburn, AL (United States), 23-26 Mar 1998

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  • Other: DE98004882
  • Report No.: ORNL/CP--97360
  • Report No.: CONF-980365--
  • Grant Number: AC05-96OR22464;AI05-86ER53237
  • Office of Scientific & Technical Information Report Number: 672024
  • Archival Resource Key: ark:/67531/metadc706078

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  • April 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 5, 2015, 2:55 p.m.

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Bannister, M.E.; Djuric, N.; Woitke, O.; Dunn, G.H.; Chung, Y.S.; Smith, A.C.H. et al. Recent experiments on near-threshold electron-impact excitation of multiply charged ions, article, April 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc706078/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.