We calculated relativistic energies and Landé factors for 5d6s 2 , 5d 2 6s, 5d3 , 5d6s7s, 4f 6s6p, 5d6s6p, 5d 2 6p, and 4f 5d6s levels in neutral lanthanum (Z = 57). We also obtained electric dipole transition energies and lifetimes for some excited levels. The calculations are based upon the multiconfiguration Hartree-Fock method within the framework Breit-Pauli relativistic corrections. Moreover, the results obtained were compared with other calculations and experiments.PACS numbers: 31.15.ag, 31.15.aj, 32.70.Cs

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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.

We have calculated relativistic energies, Landé factors, and lifetimes for some excited levels outside the core [Xe] in neutral ytterbium (Yb I, Z = 70) using two configuration interaction methods (multiconfiguration Hartree-Fock method within the framework of Breit-Pauli relativistic corrections developed by Fischer, and Cowan's relativistic Hartree-Fock method). Results obtained have been compared with other calculations and experiments. PACS: 31.15.ag, 31.15.aj,

We have calculated the transition energies (ionization potential, excitation energies, electron affinity) of neutral lanthanum (La I) and singly ionized lanthanum (La II). The calculations are based upon the multiconfiguration Hartree-Fock (MCHF) method within the framework of Breit-Pauli relativistic corrections. These energies are important for determination of physical and chemical properties for La I and La II. Results obtained have been compared with other works.