MCDF-RCI predictions for structure and width of Kα1,2 x-ray line of Al and Si

•Structure of Al and Si Kα x-ray lines has been predicted by MCDF-RCI calculations.•Influence of electron correlation on spectra structure has been studied.•Possible satellite contributions have been predicted.•Comparison to experimental spectra results in satisfactory but not-fully agreement.

Multiconfiguration Dirac-Fock and Relativistic Configuration Interaction methods have been employed to predict the structure and the width of Kα1,2 x-ray lines of Al and Si. The influences of electron correlation and inclusion of possible satellite contributions on spectra structure have been studied. The widths of K and L2,3 atomic levels of Al and Si have been also computed.