Relative intensity of dielectronic satellite spectra for highly charged He-like ions (1s2l"nl-1s2n'l', n, n'=2, 3) with Z=6-54

Abstract

Relative intensities of dielectronic satellite lines determined by radiative transition probabilities and autoionization rates have been calculated for the transitions 1s2l"nl-1s2n'l', n, n'=2, 3 in a wide range of nuclear charge Z. These data together with the wavelengths were computed for all satellite lines. Using these data synthetic spectra could be built for different plasma sources. Perturbation theory method has been applied for the calculation of atomic properties of autoionization states. Correlation, relativistic and radiative effects have been taken into account. Factor intensities Qd of dielectronic satellite lines are shown as functions of Z for different types of transitions. The Z-dependencies of the Qd values have been analysed and very pronounced sharp peaks have been discovered for this atomic characteristic indicating that some lines are prominent for specific ionic states and disappear for other ones. A possible explanation for such a behaviour of this atomic characteristic is presented. The resulting theoretical wavelengths for both satellite lines (1s2l"nl-1s2n'l', n, n'=2, 3) and resonance lines (1snp 1,3Pt-1s2, n=2, 3 and 1s2s 1,3S-1s2) are compared with available experimental data along isoelectronic sequences to identify irregularities in the experimental data and to predict wavelengths of ions whose values are unknown or uncertain.