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Astron. Astrophys. Suppl. Ser. 132, 99-105

Electron-impact excitation rates of Na-like ions

E. Kimura1 - A. Ohsaki1 - S. Nakazaki1 - Y. Itikawa2

Send offprint request: S. Nakazaki
Correspondence to:

1 - Department of Materials Science, Faculty of Engineering, Miyazaki University, Miyazaki 889-2192, Japan
2 - Institute of Space and Astronautical Science, Yoshinodai, Sagamihara 229-8510, Japan

Received January 20; accepted March 30, 1998


Electron excitation collision strengths for all the transitions among 3s, 3p, 3d, 4s, 4p, 4d, 4f states of the five Na-like ions Al III, Si IV, S VI, Ar VIII and Ca  X are calculated in the R-matrix approximation. Eleven target terms are included in the expansion of the total wavefunction. These collision strengths are averaged over a Maxwellian velocity distribution to obtain effective collision strengths as a function of electron temperature. The resulting values are compared with the results of previous less elaborate calculations to find some disagreements.

Key words: atomic data

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