Electron impact excitation of helium-like ions up to N=4 levels including radiation damping

@inproceedings{Delahaye2006ElectronIE,
  title={Electron impact excitation of helium-like ions up to N=4 levels including radiation damping},
  author={Franck Delahaye and Anil Kumar Pradhan and Claude J. Zeippen},
  year={2006}
}
The primary X-ray diagnostic lines in He-like ions are mainly excited by electron impact from the ground level to the n = 2 levels, but at high temperatures n > 2 levels are also excited. In order to describe the atomic processes more completely collision strengths are computed for OVII including for the first time all of the following: (i) relativistic fine structure, (ii) levels up to the n = 4, and (iii) radiation damping of autoionizing resonances. The calculations are carried out using the… 

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