Theoretical study on energy structures and radiative transition characteristics of highly charged Ni-like ions

C.Z. Dong1), L.Y. Xie1), J.J. Wan1) and J. Yan2)

1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

The structure of highly charged Ni-like ions has been an attractive subject of theoretical and experimental investigations because of its strong appliance background in the plasma spectrum modeling and the X-ray laser developing in recent years. As it has been pointed out before [1-5], there are many strong configuration mixing among the excited states along the Ni-like sequence. As a result, the behaviors of the transition probabilities that are dependent on Z become anomalous. Although there are many theoretical and experimental researches for Ni-like ions in the past years, the accurate transition data is still limited up to now.
In this work, excitation energies, transition wavelengths and probabilities of the 3s23p63d10, 3s23p63d94l, 3s23p53d104l, 3s3p63d104l(l=s, p, d, f)states along the Ni-like sequence from Z=31-92 are calculated by using the Multi-configuration Dirac-Fock package GRASP92[6] and a newly developing radative transition program REOS99[7]. In the calculations, the correlation and relaxation effects are included systematically. Based on the systematic calculations, all possible energy-crossings among the level groups with the same parity and total angle momentum have been found. It is showed that there are strong configuration interactions between those levels with energy-crossings at many particular Z regions, and which cause transition probabilities changes dramatically. By studying of the E1 transition probabilities from the 13 low-lying excited states with JP=1- to the ground state 3s23p63d10 1S0, some general features of the effects of strong configuration interactions on Z-dependence transition probabilities are presented, and expected to be tested in the future.

References

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[6] F. A. Parpia et al., Compt. Phys. Commun. 94 (1996)247
[7] S. Fritzsche et al., Compt. Phys. Commun. 124 (2000)340


This study is sponsored by the National Natural Science Foundation of China (Grant No. 10274062,10376026)and the Foundation for the Excellent Youth Scholars of the Ministry of Education of China.