Energy-Crossing and Its Effect on Lifetime of the 4 s ² 4 p ² P _3/2 Level for Highly Charged Ga-Like Ions

Abstract

The multi-configuration Dirac-Fock method is employed to calculate the energy levels and transition probabilities for the electric dipole allowed (E1) and forbidden (M1, E2) lines for the 4𝑠 2 4𝑝, 4𝑠4𝑝 2 and 4𝑠 2 4𝑑 configurations of highly charged Ga-like ions from 𝑍 = 68-95. The lifetimes of the 4𝑠 2 4𝑝 2 𝑃 3/2 level of the ground configuration are also derived. Based on our calculations, it is found that the energy level of the 4𝑠 2 4𝑝 2 𝑃 3/2 is higher than that of the 4𝑠4𝑝 2 4 𝑃 1/2 for the high-𝑍 Ga-like ions with 𝑍 ≥ 74, so as to generate an energy crossing at 𝑍 = 74. The effect of the energy crossing is important to the calculation of the 4𝑠 2 4𝑝 2 𝑃 3/2 level lifetime for Ga-like ions with 𝑍 ≥ 74.

Spectroscopic analysis of N-intrashell transitions in Rb-like to Ni-like Yb ions

“…Using the parametric potential code RELAC, they also reported a theoretical wavelength of 5.608 nm, which is closer to our measured wavelength than their measurement of 5.74 nm. Our measured wavelengths for these three transitions are in excellent agreement with the calculations of Fan et al [51], which employed GRASP2K code to determine the energy levels and the transition probabilities for 4s 2 4p, 4s4p 2 , and 4s 2 4d configurations of Ga-like ions. Their calculations also showed excellent agreement with the high-precision EBIT measurements of the 4p − 4d transition in W, Os, and Au ions, which further establishes the reliability of the calculations.…”

“…The wavelength of the resonance transition in Ga-like ions was also reported by Hu et al [52] using GRASP, which agrees to within 0.09% of our wavelength. Quinet et al [53] also used GRASP to calculate the wavelengths of the dipole allowed (4s 2 4p-4s 2 4d and 4s 2 4p-4s4p 2 ) and forbidden M1 and E2 transitions within the ground state configuration 4s 2 4p, with reduced electron correlations compared to Fan et al [51]. Their results exhibit reasonable agreement with our measured wavelengths.…”

Energy levels and transition data of 3p63d8 and 3p53d9 configurations in Fe-like ions (Z = 57,60,62,64,65)

“…Atomic structure parameters have been considered as a promising approach to improve our understanding of the physical processes of astrophysical plasmas. [1][2][3][4] On the other hand, knowledge of emission lines generated by these high-Z elements is essential for the abundance of stars. [5] It is therefore a continuous focus of attention.…”

Correlation effects on the fine-structure splitting within the 3d 9 ground configuration in highly-charged Co-like ions

“…[1][2][3][4] Among them the electric-dipole forbidden transition lines are of particular importance in plasma diagnostics due to their sensitive intensities to electron temperature and density and other plasma parameters. [5][6][7][8][9][10][11] The currently famous elements (for example, tungsten and gold) have inspired great research interest since their favorable physical properties, and many spectra lines have been measured with high accuracy. [12][13][14][15][16][17][18][19][20][21][22] Meanwhile, the accurately measured properties, such as wavelength, can provide crucial tests for atomic structure theory of both the electron correlation and relativistic corrections, [23,24] which are the major questions in theoretical calculations.…”