Effect of radiative cascades on intensities of dielectronic satellites to Heα

Radiative cascades into autoionizing states 1s2l2l' in Li-like ions are studied. The correction function that describes the effect of cascades on level populations is calculated using the 1/Z-expansion method for the range of nuclear charges Z=10-30. It is shown that for the q-satellite, which is often used in hot plasmas for diagnostic purposes, the contribution of radiative cascades may be three orders of magnitude larger than the direct dielectronic capture. Time-dependent collisional-radiative modeling is used to calculate satellite intensities and determine spectra modifications due to radiative cascades.