Intermediate coupling collision strengths for delta N = 0 transitions produced by electron impact on highly charged ions. I - Theoretical development and application to N = 2 levels in helium-like ions

Abstract

view Abstract Citations (23) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Intermediate coupling strengths for DELTA n=0 transitions produced by electron impact on highly charged ions. I. Theoretical development and application to n=2 levels in helium-like ions. Sampson, D. H. ; Clark, R. E. H. Abstract A Coulomb-Born exchange method previously developed has been extended to transitions involving no change in principal quantum number n with intermediate coupling and configuration mixing effects included. The theory is used to calculate the collision and electric dipole line strengths for all fine-structure transitions with delta n = 0 and n = 2 in helium-like ions with nuclear charge number Z in the range between 6 and 74. This covers the entire range of Z of interest for astrophysical and controlled nuclear fusion applications; procedures are given for obtaining fits to the collision strength data using a simple form that is readily integrated over a Maxwellian energy distribution function to obtain collision rates. Publication: The Astrophysical Journal Supplement Series Pub Date: October 1980 DOI: 10.1086/190689 Bibcode: 1980ApJS...44..169S Keywords: Electron Impact; Electron Transitions; Fine Structure; Helium Ions; Ionic Collisions; Transition Probabilities; Astronomical Models; Atomic Energy Levels; Controlled Fusion; Electric Dipoles; Spectral Energy Distribution; Plasma Physics; Transition Probabilities full text sources ADS | Related Materials (1) Erratum: 1982ApJS...49Q.593S