The resonant energy E_di (eV), radiative transition probabilities A_di (s⁻¹) and total natural width Γ_d (eV) of the 2snp ^{1, 3}P₁ resonant transitions to the ground states of Fe¹⁶⁺, Kr²⁶⁺ and Xe⁴⁴⁺

Table 4. The resonant energy E_di (eV), radiative transition probabilities A_di (s⁻¹) and total natural width Γ_d (eV) of the 2snp ^{1, 3}P₁ 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 × 10^b.

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.