Article

# Energy levels and lifetimes of Nd IV, Pm IV, Sm IV, and Eu IV

Physical Review A (Impact Factor: 3.04). 09/2003; 68(3). DOI: 10.1103/PhysRevA.68.032503

Source: arXiv

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**ABSTRACT:**The atomic properties of Pm-like ions were comprehensively studied using relativistic atomic codes. Excitation energies of the 4f^{14}nl (with nl=5s, 6s, 5p, 6p, 5d, 6d, and 5f) states in Pm-like ions with nuclear charge Z ranging from 74 to 100 are evaluated within the framework of relativistic many-body theory (RMBPT). First- and second-order Coulomb energies and first- and second-order Breit corrections to the energies are calculated. Two alternative treatments of the Breit interaction are investigated. In the first approach we omit Breit contributions to the Dirac-Fock potential and evaluate Coulomb and Breit-Coulomb corrections through second order perturbatively. In the second approach were included both Coulomb and Breit contributions on the same footing via the Breit-Dirac-Fock potential and then treat the residual Breit and Coulomb interactions perturbatively. The results obtained from the two approaches are compared and discussed. The important question of what is the ground state in Pm-like ions was answered. Properties of the 4f-core-excited states are evaluated using the multiconfiguration relativistic Hebrew University Lawrence Livermore atomic code (hullac code) and the Hartree-Fock-relativistic method (cowan code). We evaluate excitation energies and transition rates in Pm-like ions with nuclear charge Z ranging from 74 to 92. Our large scale calculations include the following set of configurations: 4f^{14}5s, 4f^{14}5p, 4f^{13}5s^{2}, 4f^{13}5p^{2}, 4f^{13}5s5p, 4f^{12}5s^{2}5p, 4f^{12}5s5p^{2}, and 4f^{12}5p^{3}. Trends of excitation energies as function of Z are shown graphically for selected states. Excitation energies, transition rates, and lifetimes in Pm-like tungsten are evaluated with additional inclusion of the 4f^{11}5s^{2}5p^{2}, 4f^{11}5s5p^{3}, 4f^{10}5s^{2}5p^{3}, and 4f^{10}5s5p^{4} configurations. This represents an unusual example of an atomic system where the even-parity complex [4f^{14}5s+4f^{13}5s5p+4f^{12}5s5p^{2}+4f^{11}5s5p^{3}+4f^{10}5s5p^{4}] and the odd-parity complex [4f^{14}5p+4f^{13}5s^{2}+4f^{12}5s^{2}5p+4f^{11}5s^{2}5p^{2}+4f^{10}5s^{2}5p^{3}] include so different configurations. Wavelengths of the 4f^{14}5s^{2}S_{1/2}-4f^{14}5p^{2}P_{J} transition obtained by the cowan, hullac, and RMBPT codes are compared with other theoretical results and available measurements.Physical Review A 09/2013; 88(3). · 3.04 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Transition probabilities and oscillator strengths for electric dipole radiation in triply ionized praseodymium are reported for the first time in this paper. They were computed using a semi-empirical relativistic Hartree–Fock approach including core-polarization effects. Due to the lack of experimental data in the Pr IV spectrum, the accuracy of our results is estimated and discussed on the basis of comparisons between calculations performed with a similar physical model and laboratory measurements previously published for the isoelectronic ion Ce2+. In view of their great interest in optical materials and nanophotonics, radiative rates for forbidden lines within the 4f2 ground-state configuration of Pr3+ were also calculated in our work.Journal of Physics B Atomic Molecular and Optical Physics 07/2013; 46(14):145003. · 2.03 Impact Factor -
##### Article: Relativistic Hartree-Fock calculations of transition rates for allowed and forbidden lines in Nd IV

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**ABSTRACT:**A pseudo-relativistic Hartree-Fock model including a large amount of configuration-interaction effects has been used to compute radiative decay rates for allowed and forbidden transitions in Nd IV. Detailed comparisons of transition probabilities, oscillator strengths and radiative lifetimes with data previously published are also reported and discussed in the present work.Journal of Physics B Atomic Molecular and Optical Physics 01/2014; 47(3). · 2.03 Impact Factor

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