|Electron impact excitation of Fe XXI|
|K. Butler and C.J. Zeippen|
|Astronomy & Astrophysics Supplement Series, 2000, Vol.143, pp.483-489|
Collision strengths and collisional rate parameters are provided for
transitions among the and 2p levels of C-like Fe XXI.
have been computed in a 52-state Breit-Pauli approximation thus accounting
for the most prominent relativistic effects. An R-matrix close-coupling
calculation comprising partial wave contributions up to and of order
8000 energy points in the range up to 260 Ryd gave cross sections expected
to be accurate to better than 20% for transitions among the levels.