Energy levels and radiative rates for transitions in Co XI^*

¹ Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, Northern Ireland, UK e-mail: K.Aggarwal@qub.ac.uk
² Centre for Theoretical Studies of Physical Systems, Clark Atlanta University, Atlanta Ga 30304, USA

Received: 5 June 2007
Accepted: 19 July 2007

Abstract

Aims. In this paper we report calculations for energy levels and radiative rates for transitions in Co xi.

Methods. The General purpose Relativistic Atomic Structure Package (grasp) and the Flexible Atomic Code (fac) have been adopted for the calculations of energy levels and radiative rates.

Results. Energies for the lowest 287 levels of Co xi, including those among the (1s²2s²2p⁶) 3s²3p⁵, 3s3p⁶, 3s²3p⁴3d, 3s3p⁵3d, 3s²3p³3d², and 3s²3p⁴4s configurations, are reported. Additionally, radiative rates and oscillator strengths are reported for all electric dipole (E1) transitions with among these levels, and similar results for magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions are reported only for those with . Comparisons are made with the available results in the literature, and the accuracy of the present data is assessed. Finally, lifetimes for all excited levels are also listed, although measurements are presently available for only one of these.