  Multiconfiguration Dirac-Fock and Relativistic Configuration Interaction
methods have been employed to predict the structure and the width of
$K\alpha_{1,2}$ 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 $L_{2,3}$ atomic levels of
Al and Si have been also computed.
