Theoretical investigation on forbidden transition properties of fine-structure splitting in 2D state for K-like ions with **Project supported by the National Natural Science Foundation of China (Grant Nos. 91436103, 91536102, and 91336211), the Research Programme of National University of Defense Technology, China (Grant No. JC15-0203), and the Strategic Priority Research Programme of the Chinese Academy of Sciences (Grant No. XDB21030300).

Abstract

Excitation energies, magnetic dipole, and electric quadrupole transition probabilities of the transition in the potassium-like (K-like) sequence with are investigated by using the multi-configuration Dirac–Hartree–Fock (MCDHF) method. The contributions of the electron correlations, Breit interaction, and the leading-order quantum electrodynamic (QED) effects on the transition properties are analyzed. The present results are interested in the laboratory tokamak and the astronomical observations. Furthermore, the feasibility of these ions for the highly charged ion (HCI) clocks is discussed. Considering the wavelength of lasers and manipulation process of the atomic clocks, Cu10+ and Zn11+ are recommended as promising candidates with achievable quality factors at the 1015 level.