The resonant energy <em>E_di</em> (eV), radiative transition probabilities <em>A_di</em> (<em>s</em>⁻¹) and total natural width Γ_<em>d</em> (eV) of the 2s<em>n</em>p ^{1, 3}P₁ resonant transitions to the ground states of Fe¹⁶⁺,

Table 4. The resonant energy Edi (eV), radiative transition probabilities Adi (s−1) and total natural width Γd (eV) of the 2snp 1, 3P1 resonant transitions to the ground states of Fe16+, Kr26+ and Xe44+. B and C represent the Babushkin gauge and Coulomb gauge, respectively. a(b) represents a × 10b. Abstract Photoionization (PI) cross sections of the ground state 1s2 2s2 2p61 S0 of Ne-like Ar8+, Fe16+, Kr26+ and Xe44+ ions are calculated by using the Dirac atomic R-matrix code based on a fully relativistic R-matrix method. To analyze the detailed resonant structure, systematical calculations based on the multiconfiguration Dirac–Fock method are performed for the dominant 2s → np resonant transitions, and the resonant energies, strengths and total natural widths are presented. The resonant structures and characteristics of the PI cross sections and resonance strengths along the Ne-like sequence are discussed with emphasis on the influence of relativistic effects. For the Ar8+ ion, good agreement is found between the present results and available theoretical calculations and experimental data.