J. Phys. IV France 11 (2001) Pr2-309-Pr2-312
Electron impact excitation of Al XIII : Collision strengths and rate coefficientsK.M. Aggarwal1, F.P. Keenan1 and S.J. Rose2
1 Department of Pure and Applied Physics, The Queen's University of Belfast, Balfast BT7 1NN, Northern Ireland
2 Plasma Physics Group, Rutherford Appleton Laboratory, Oxon OX11 0QX, U.K.
Collision strengths for transitions among the n = 5 levels of Al XIII have been computed in the LS coupling scheme using the R-matrix code. All partial waves with angular momentum [MATH] have been included, and resonances have been resolved in a fine energy grid in the threshold region. Collision strengths have been computed at energies below 220.0 Ryd, and effective collision strengths, obtained after integrating the collision strengths over a Maxwellian distribution of electron velocities, are calculated over a wide temperature range of [MATH].
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