Electron excitation of 3s3p and 3s3p3d fine-structure
transitions in Fe X |

J.C. Pelan and K.A. Berrington |

Astronomy & Astrophysics Supplement Series, 2000, in press |

Electron excitation collision strengths for fine-structure collisions
3s3p - 3s3p, 3s3p - 3s3p3d and
3s3p - 3s3p3d in Fe X, are calculated using a 180-level
Breit-Pauli R-matrix calculation containing the above levels together with
those from 3s3p3d and 3s3p3d configurations. The collision
strength is averaged over a Maxwellian velocity distribution to obtain the
effective fine-structure collision strengths as a function of electron
temperature form (K) = 5.4 - 7.0. We show that the effective
collision strength is considerably enhanced due to low-energy resonances.

2006-10-25