Blue satellite structure near He_α and He_β and redistribution of level populations

For a wide class of ions a mechanism for the emission of blue satellites close to the He-like resonance line in dense plasmas is proposed. It is based on the collisional transfer of population between autoionising levels. Detailed collisional radiative calculations involving all J-split autoionising levels are carried out for Al and may serve as a benchmark. A general consideration of redistribution effects inside the autoionising levels discovered diagnostically attractive density effects for laser-produced plasmas for both the He_α and He_β satellite structure.