Radiative damping and interference in the resonance structure of the electron-impact excitation cross sections for Ti{sup 20+}
- Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
- Department of Physics and Applied Physics, University of Strathclyde, Glasgow, G4 0NG (United Kingdom)
We have performed {ital R}-matrix calculations for the electron-impact excitation of a highly charged ion in which an optical potential is included to allow for radiative damping of intermediate resonance states. The present case considered is that of electrons incident on Ti{sup 20+} ions. Comparisons with undamped {ital R}-matrix calculations, distorted-wave calculations, and experimental measurement are made. The radiative optical potential accounts for significant damping of high-{ital n} resonances. Configuration interaction between resonances, which is automatically incorporated in the {ital R}-matrix method but usually omitted in the implementation of distorted-wave techniques, was found to increase the resonance contributions considerably. Our radiative-damped {ital R}-matrix cross sections show fairly good agreement with the resonance profile obtained from electron beam ion trap measurements [S. Chantrenne {ital et} {ital al}., Phys. Rev. Lett. {bold 69}, 265 (1992)]. This system demonstrates the necessity for simultaneously including radiative-damping and interfering-resonance effects within electron--highly charged ion scattering calculations.
- OSTI ID:
- 132905
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 52; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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