Theoretical study of energy levels and radiative properties of Be-like W⁷⁰⁺

Highlights: • In present calculation, the effect of configuration interaction (CI) and core-valence (CV) correlations is used. • Energies of Lowest 215 fine structure levels for Be-like W⁷⁰⁺ using GRASP2K and FAC are presented. • Radiative data for E1, E2, M1 and M2 EUV and SXR transitions from ground state are reported. • Comparison of our calculated atomic data with available experimental and theoretical results of Be-like W⁷⁰⁺. - Abstract: We report an extensive theoretical study of the Be-like W⁷⁰⁺ spectrum in a wide energy range. We present accurate calculated 215 fine-structure energy levels related to the configurations 1s²2s², 1s²2p², 1s²nƖn′l′ (n = 2, n′ = 2–7 Ɩ = s, p Ɩ′ = s, p, d, f, g), which may be useful ion for fusion plasma research. We have identified wavelengths of extreme ultraviolet (EUV) and X-ray transitions using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method implemented in the GRASP2K code. The calculations are carried out in the active space approximation with the inclusion of the Breit interaction, the finite nuclear size effect, and quantum electrodynamic corrections. Transition data are reported for multipole transitions from the ground state. We have discussed discrepancy graphically with available results. We have also graphically explained the convergence in excitation energies with active sets. We predict new energy levels and transition parameters where no other experimental or theoretical results are available. The present complete set of results should be of help in line identification and the interpretation of spectra, as well as in modeling and diagnostics of fusion plasmas.