Electron impact excitation of Helium-like ions up to n=4 levels including radiation damping

Helium-like ions provide the most important X-ray spectral diagnostics in high temperature fusion and astrophysical plasmas. We previously presented computed collision strengths for O~VII including relativistic fine structure, levels up to the \(n=4\) complex and radiation damping of autoionizing re...

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Bibliographic Details
Published in:arXiv.org 2006-03
Main Authors: Delahaye, Franck, Pradhan, Anil K, Zeippen, Claude J
Format: Article
Language:English
Subjects:
Aluminum
Calcium
Damping
Diagnostic systems
Dipoles
Eigenvectors
Electron impact excitation
Extrapolation
Fine structure
Forbidden transitions
Ground level
Helium
High temperature
Magnesium
Mathematical analysis
Plasma diagnostics
Plasmas (physics)
Radiation effects
Silicon
X ray spectra
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Summary:Helium-like ions provide the most important X-ray spectral diagnostics in high temperature fusion and astrophysical plasmas. We previously presented computed collision strengths for O~VII including relativistic fine structure, levels up to the \(n=4\) complex and radiation damping of autoionizing resonances. We have extended this work to other He-like ions (N, Ne, Mg, Al, Si, S, Ca). The calculations are carried out using the Breit-Pauli R-matrix (BPRM) method with a 31-level eigenfunction expansion. Collision strengths for the principal lines important in X-ray plasma diagnostics, w, x, y and z, corresponding to the 4 transitions to the ground level 1s^2(^1S_0)
ISSN:2331-8422
DOI:10.48550/arxiv.0603482