7th International Conference on X-Ray Lasers

J. Phys. IV France 11 (2001) Pr2-313-Pr2-316
DOI: 10.1051/jp4:2001260

Electron impact excitation of Gd XXXVII and radiative rates for Ni-like ions with 60 [MATH]

K.M. Aggarwal¹, P.H. Norrington², K.L. Bell², F.P. Keenan¹, G.J. Pert³ and S.J. Rose<sup>4

1</sup>  Department of Pure and Applied Physics, The Queen's University of Belfast, Balfast BT7 1NN, Northern Ireland
²  Department of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast, Balfast BT7 1NN, Northern Ireland
³  Department of Physics, University of York, Heslington, York YO10 5DD, U.K.
⁴  Plasma Physics Group, Rutherford Appleton Laboratory, Oxon OX11 0QX, U.K.

Abstract
Energy levels and radiative rates for transitions among the 107 fine-structure levels belonging to the (1s²2s²2p⁶) 3s²3p⁶3d¹⁰, 3s²3p⁶3d⁹4l, 3s²3p⁵3d¹⁰4l, and 3s3p⁶3d¹⁰4l configurations of Ni-like ions with [MATH] have been calculated using the GRASP code. The collision strengths ([MATH]) have also been computed for transitions in Gd XXXVII at energies below 800 Ryd, using the DARC code. Resonances have been resolved in a fine energy mesh in the threshold region, and excitation rate coefficients have been calculated for transitions from the ground level to excited levels at temperatures below 2500 eV. These have been compared with those available in the literature, and enhancement in the values of rates, due to resonances, has been observed up to an order of magnitude for some of the transitions.

© EDP Sciences 2001