Effective collision strengths for hyperfine structure transitions of possible astrophysical interest

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The fully relativistic distorted wave code of [1] and [2], which uses the factorization method of [3], has been modified to calculate collision strengths for hyperfine structure transitions [4] and applied to several cases of possible astrophysical interest. The results are averaged over a maxwellian distribution function for the electrons to obtain the effective collision strengths for use in determining rate coefficients. [1] H.L. Zhang, D.H. Sampson, and A. K. Mohanty, Phys. Rev. A 40, 616 (1989).\vspace*-0.5baselineskip [2] H.L. Zhang and D.H. Sampson, Phys. Rev. A 47, 208 (1993).\vspace*-0.5baselineskip [3] A. Bar-Shalom, M. Klapisch, and J. Oreg, Phys. Rev. A 38, 1773 (1988).\vspace*-0.5 [4] D.H. Sampson and H.L. Zhang, J. Phys. B 30, 1449 (1997).

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