The Z⁴ scaled radiative transition probabilities A_di (s⁻¹) for the 2snp ^{1, 3}P₁ → 2s²2p^6 1S₀ (6 ≤ n ≤ 13) transition and Auger branch ratios B_a of different states of Fe¹⁶⁺, Kr²⁶⁺ and Xe⁴⁴⁺, as a function of the principal number n

Figure 3. The Z⁴ scaled radiative transition probabilities A_di (s⁻¹) for the 2snp ^{1, 3}P₁ → 2s²2p^6 1S₀ (6 ≤ n ≤ 13) transition and Auger branch ratios B_a of different states of Fe¹⁶⁺, Kr²⁶⁺ and Xe⁴⁴⁺, as a function of the principal number n.

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.