The Hyperfine Structure Calculations οf Some Excited Levels for¹³⁹La I

Abstract

We calculated hyperfine structure constants of the 5d6s 2 , 5d 2 6s, 5d 3 , 5d 2 7s, 5d6s7s, 5d6p 2 , 4f 2 5d, 4f 6s6p, 5d6s6p, 5d 2 6p, 4f 5d6s and 4f 5d 2 levels for 139 La I (Z = 57). The calculations are based upon the multiconfiguration Hartree-Fock method within the framework of the Breit-Pauli relativistic corrections. Moreover, the results obtained were compared with other available calculations and experiments.

Energy Levels and the Landé -Factors for Singly Ionized Lanthanum

“…We have performed the atomic structure calculations on lanthanide atoms and ions, systematically. We reported some works related to these atoms and ions using the methods mentioned above [31][32][33][34][35][36][37][38][39][40][41][42]. In addition, we presented the energies of 5d 2 , 5d6s, 6s 2 , and 6p 2 excited levels and ionization energy for La II by the MCHF+BP method [34].…”

Energies, Landé Factors, and Lifetimes for Some Excited Levels of Neutral Ytterbium (Z = 70)

“…We reported various atomic structure calculations such as transition energies, hyperfine structure, lifetimes, and electric dipole transitions for some rare-earth elements (La I, La II, Lu I and Ac I) [50][51][52][53][54][55][56].…”

Energies and Landé factors for some excited levels in Lu I (Z = 71)

“…The open shells for both of them are the same. We have therefore selected similar configuration sets as in our previous works related to La I [17][18][19] in order to consider correlation effects. All possible configuration state functions (CSFs) from the configurations mentioned above include 398 for MCHF calculations, in LS coupling, and 939 for MCHF plus Breit-Pauli effects calculations, in LSJ coupling.…”

“…In conclusion, we calculated energies, electric dipole transitions, lifetimes and hyperfine effects for selected levels of La I [17][18][19]. We intended to attempt a similar theoretical investigation on the homologous spectrum of lutetium, Lu I.…”