The 3d 2 D 5/2−2 D 3/2 magnetic dipole transition in potassium-like ions

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Vol. 57; no. 9; pp. 95002 - 95008
• Main Authors: Qian, Yuyuan, Zhang, Chunyu, Zhang, Yizhuo, Chen, Jihui, Ding, Xiaobin, Huang, Liangyu, Yang, Yang, Fu, Yunqing, Chen, Chongyang, Yao, Ke
• Format: Journal Article
• Language: English
• Published: IOP Publishing 14.05.2024
• Subjects: EBIT; K-like ions; magnetic dipole transition; MCDHF
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/1361-6455/ad38aa

Abstract Spectral lines of the magnetic-dipole transition between the 3 d 2 D 3 / 2 , 5 / 2 levels of K-like Kr 17+ , Zr 21+ , Nb 22+ , Mo 23+ , and Ru 25+ ions were measured in a compact electron beam ion trap. By means of dedicated calibration methods, the transition wavelengths of Kr 17+ , Zr 21+ , and Mo 23+ ions reduce uncertainties by at least one order of magnitude and the wavelengths of Nb 22+ and Ru 25+ ions are measured for the first time at a few ppm level. In addition, the fine-structure energy splittings were systematically calculated using the multiconfiguration Dirac–Hartree–Fock method combined with the relativistic configuration interaction approach. The contributions of the core-valence and core-core electron correlations, the Breit interaction and QED effect were discussed in detail. The results show that it is essential to include deep core-valence correlation of L -shell and core-core valence correlation of 3 p subshell to obtain an agreement better than 0.15% with existing experimental values. The calculation model can be performed to predict the wavelength within a high accuracy for a wide range of potassium-like ions.