The influence from high-n dielectronic satellites to Kɑ resonance line in helium-like aluminium

Based on the multi-configuration Dirac--Fock method, this paper has made theoretical calculations for the dielectronic recombination cross-sections and the high-n dielectronic satellites to K\alpha resonance line in helium-like aluminium ions. It is found that high-n dielectronic satellites are seriously mixed with resonance line, which leads to a significant increase in both the apparent width and the intensity of K\alpha resonance line. They also induce a positional shift of K\alpha resonance line.