Taa. Sigut et Ak. Pradhan, ELECTRON-IMPACT EXCITATION OF MG-II - COLLISION STRENGTHS AND RATE COEFFICIENTS, Journal of physics. B, Atomic molecular and optical physics, 28(22), 1995, pp. 4879-4893
Collision strengths for low-energy electron-impact excitation of Mg It
are computed in a ten-state close-coupling approximation using the R-
matrix method. Fine-structure transitions among the 17 associated leve
ls are considered explicitly through algebraic transformation of the s
cattering matrices. Detailed comparisons are made with the merged-beam
experiment of Smith and co-workers and the crossed-beam experiment of
Zapesochnyi and co-workers; the present results are found to be in ve
ry good agreement with the former for the 3s-3p resonance transition.
A comparison with earlier theoretical calculations is also made. Maxwe
llian-averaged rate coefficients are calculated for transitions betwee
n the target levels considered, and a selection of these results is pr
esented for practical applications.