Correlation, Breit and Quantum Electrodynamics effects on energy level and transition properties of W54+ ion

Abstract

Abstract. The electron correlation effects and Breit interaction as well as Quantum Electro-Dynamics (QED) effects were expected to have important contribution to the energy level and transition properties of heavy highly charged ions. The ground states [Ne]3s 2 3p 6 3d 2 and first excited states [Ne]3s 2 3p 5 3d 3 of W 54+ ion have been studied by using Multi-Configuration Dirac-Fock method with the implementation of Grasp2K package. A restricted active space was employed to investigate the correlation contribution from different models. The Breit interaction and QED effects were taken into account in the relativistic configuration interaction calculation with the converged wavefunction. It is found that the correlation contribution from 3s and 3p orbital have important contribution to the energy level, transition wavelength and probability of the ground and the first excited state of W 54+ ion.

Theoretical investigation on the soft X-ray spectrum of the highly-charged W54+ ions

“…And some transitions with wavelength in 18. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].6Å are suggested to be observed in the future experiment.…”

“…According to the synthetic spectrum there are only 3 peaks that would be observed in the EBIT experiment with this condition, namely, the transition lines with key 1, 5, and 20 in Fig. 2(b), These 3 peaks are regarded as the E1 transi- 19.260Å and 18.590Å, respectively. The lower part Fig.…”

“…Lennartsson et al observed the electric dipole (E1) transitions from the excited states [Ne]3s 2 3p 5 3d 3 to the ground state [Ne]3s 2 3p 6 3d 2 of W 54+ ion in the wavelength range of 26.3-43.5Å in the Lawrence Livermore National Laboratory (LLNL) EBIT at the electron beam energy of 18.2 keV, and a CRM was applied to explain the observed spectrum [13]. Ding and his collaborators have performed a calculation on the E1, E2, M1, M2 transitions between [Ne]3s 2 3p 5 3d 3 and [Ne]3s 2 3p 6 3d 2 levels of W 54+ ion by using an MCDF method with the restricted active space method; the relativistic and electron correlation effects as well as the Breit interaction and some Quantum Electrodynamic effects have been taken into account [11,19,20]. The results are in reasonable agreement with available experimental data for both M1 and E1 transition lines.…”

Atomic and Molecular Data and their Applications

“…Beginning with basic atomic structure, the work of Ding et al [1] on the energy levels and transition probabilities of the 54-times ionized tungsten ion W 54+ shows that relativistic and quantum electrodynamic corrections make an important contribution in these heavy highly-ionized ions, and must be taken into account to get physically significant results. This result can generally be expected to be true for all heavy ions, and so comparisons with experiment are important.…”

Collisional radiative model for the M1 transition spectrum of the highly-charged W 54+ ions

“…Many research works on the radiative properties of tungsten ions related to fusion in various ionization stages have been published in the past several decades [5][6][7][8][9][10][11][12][13]. Special attention has been paid to the magnetic dipole (M1) transitions of the W 54+ ion [14][15][16][17][18][19][20][21][22][23]. In their electron beam ion trap (EBIT) experiment, Ralchenko et al [14] observed two emission peaks at 14.986 nm and 17.144 nm, which they identified with M1 transitions between the levels of the ground configuration [Ne]3s 2 3p 6 3d 2 of W 54+ .…”