Isolated-core excitations in strong electric fields. III. The Ba 6p{sub j}nk series
- Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
The cross section for isolated-core excitation (ICE) of barium 6p{sub j}n{sup '}k{sup '} autoionizing states from 6snk Stark levels has been measured as a function of applied electric-field strength. For the most part, states that are well mixed by the applied field have nearly Lorentzian line shapes indicating predominant ICE of a single autoionizing resonance with n{sup '}=n and k{sup '}=k. Small non-Lorentzian shake-up features in the wings of the lines are examined in detail using high laser power to depletion broaden the main resonance and amplify the wings of the line shapes. While analogous shake-up features in zero-field ICE spectra are easily described theoretically, attempts to reproduce the spectra observed in a field generally fail to provide good agreement. Finally, significant differences in excitation of Ba{sup +} 6p{sub 1/2} rather than Ba{sup +} 6p{sub 3/2} cores are observed. (c) 2000 The American Physical Society.
- OSTI ID:
- 20217465
- Journal Information:
- Physical Review. A, Vol. 62, Issue 3; Other Information: PBD: Sep 2000; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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