Magnetic Quadrupole M2 Forbidden Transitions Of Highly Charged Ions

The Magnetic quadrupole transitions M2 in highly charged ions (HCI) is one of the most important intercombination transitions. The properties of such forbidden transition lines are of significantly applied values for various research in many fields such as the theoretical atomic structure, astrophysics, X-ray laser, ICF, MCF, plasma diagnostics, and so on.In view of Configuration interactions, a full extend relativistic multi-configuration Dirac-Fock theory with quantum electrodynamical (QED) effect and Breit correction is used to calculate and research the properties of magnetic quadrupole M2 transitions such as energy level, transition probabilities and oscillator strengths for Be-like and Mg-like ions sequence respectively in theory. Therefore we come to some important results as follows:(1) First of all, the calculated transition energy levels, transition probabilities and oscillator strengths of magnetic quadrupole 2s^{2 1}S₀-2s2p ³P₂ for Be-like and 3s^{2 1}S₀-3s3p ³P₂ for Mg-like ions sequence are better in agreements with recently experimental data than other theoretical values respectively . The results show that our choice of Configurations is reasonable and self-contained.(2) Secondly, the changes of transition energy levels of magnetic quadrupole 2s^{2 1}S₀-2s2p ³P₂ for Be-like and 3s^{2 1}S₀-3s3p ³P₂ for Mg-like ions sequence with the nuclear charge number Z shows that the contribution from QED and Breit cannot be negligible of the magnetic quadrupole transition for highly charged ions of high nuclear charge number.(3) In addition, it is found that the magnetic quadrupole transition probabilities of highly charged ions with high nuclear charge number Z are in correspondence with those of neutral atomic allowed transitions and cannot be ignored in the laser plasma of high temperature in ICF and MCF fusions through the study of changes of transition probabilities and oscillator strengths with the nuclear charge number for Be-like and Mg-like respectively . The effects of the magnetic quadrupole transition of highly charged ions with high nuclear charge number Z should be considered in the calculation of dielectronic recombination process, opacity, free path and so on.(4) Finally, The theoretically calculated properties of magnetic quadrupole transitions and other undiscovered magnetic quadrupole transitions for Be-like and Mg-like ions sequence respectively not only make up the experimental and theoretical shortage of data, but also provide the theoretical direction for the latter experimental research.