# The resonant energy *E*_{di} (eV), radiative transition probabilities *A*_{di} (*s*^{−1}) and total natural width Γ_{d} (eV) of the 2s*n*p ^{1, 3}P_{1} resonant transitions to the ground states of Fe^{16+}, Kr^{26+} and Xe^{44+}

_{di}

_{di}

**Table 4.** The resonant energy *E _{di}* (eV), radiative transition probabilities

*A*(

_{di}*s*

^{−1}) and total natural width Γ

_{d}(eV) of the 2s

*n*p

^{1, 3}P

_{1}resonant transitions to the ground states of Fe

^{16+}, Kr

^{26+}and Xe

^{44+}. 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 1s^{2} 2s^{2} 2p^{6}^{1} S_{0} of Ne-like Ar^{8+}, Fe^{16+}, Kr^{26+} and Xe^{44+} 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 → *n*p 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 Ar^{8+} ion, good agreement is found between the present results and available theoretical calculations and experimental data.