Abstract
We report theoretical close-coupling calculations for electron-impact excitation cross sections of He-like Ti XXI ions using the R-matrix method, including relativistic and radiation damping effects. The cross sections are in good agreement with experimental measurements from the electron-beam ion trap [Chantrenne et al., Phys. Rev. Lett. 69, 265 (1992)] for the four prominent x-ray transitions: 1)→1s2s), 1s2p), 1s2p), indicating that both the relativistic and the resonance effects, with radiative damping, may affect the electron-impact excitation process significantly in highly charged ions.
- Received 5 May 1995
DOI:https://doi.org/10.1103/PhysRevA.52.3366
©1995 American Physical Society