Electron Impact Excitation of Carbon-Like Ions: An Assessment of the Available Theoretical Data

Abstract

Electron impact excitation of ions of the carbon-like isoelectronic sequence from O III to Fe XXI is reviewed starting from previous critical compilations. Comparisons between results obtained from the distorted-wave and the R-matrix methods have been made. The effective collision strengths have been compared along the sequence. The isoelectronic trends should be useful in interpolating data for ions where no specific calculations are available.