Progress in the analysis of the even parity configurations of tantalum atom

The experimental work of L. Windholz, G.H. Guthöhrlein and co-workers, concerning observation of the tantalum spectrum, yield many information about new energy levels and hyperfine structure splitting. We contribute the results of the complex parametric studies of the fine- and hyperfine structure of the mentioned element up to second-order of perturbation theory, including the effects of closed shell - open shell excitations. The work has been performed for the systems including 47 even configurations. The values of the radial parameters describing the one- and many-body interactions effects on atomic structure are given. We predicted values of energy levels and their A- and B- hyperfine structure constants, also for experimentally levels not observed up to now

Investigation of the hyperfine structure of Ta I lines (V)

We report on further investigations of the hyperfine structure of spectral lines of the neutral tantalum atom. Besides determination of the hyperfine constants A and B of 21 levels we report on the discovery of 9 up to now unknown fine structure levels for which we could determine their energy position, parity, angular momentum and the constants A and B. For a large number of up to now unclassified lines the combinations could be identified

Hyperfine splitting and isotope shift in the optical transition

The laser-induced resonance fluorescence in an atomic beam was used in order to measure the hyperfine splitting of the 4ƒ76s2 8S7/2 and 4ƒ76s6p 6P5/2 levels in 151,153,155 Eu isotopes. The hfs constants A and B of the unstable 155Eu were determined for the first time: Aexp(155,8S7/2) = -8.78(3) MHz, Aexp(155,6P5/2) = -261.68(11) MHz and Bexp(155, 6P5/2) = -941(1) MHz. With these data and after corrections for second-order hyperfine structure perturbations the nuclear moments of 155Eu were deduced: μ(155) = 1.520(2) n.m. and Qs(155) = 2.494(20) b. In addition new and more precise values of the hfs constants of the excited state for the stable 151,153Eu were obtained. They are as follows: Aexp(151, 6P5/2 = -591.92(9) MHz, Bexp(151, 6P5/2) = -354.58(97) MHz and Aexp(153, 6P5/2) = -263.19(8) MHz, Bexp(153, 6P5/2) = -922.07(79) MHz. The hyperfine anomalies 151Δ153 = 0.74(4)% and 153Δ155 = 0.27(34)% were extracted from the corrected hfs constants

Observation of Pr+\text{}^{+} Ions in Paul Trap

The first observation of Pr$\text{}^{+}$ ions stored in a Paul trap is reported. Initially the ions were observed by the electronic detection method, and further the laser induced fluorescence, following resonance absorption at a certain optical transition in Pr$\text{}^{+}$ ion, which is excited from the ground state, was recorded. Moreover, fluorescence signal following the excitation from a low-lying metastable state could be detected. The Paul trap system and some other parts of the experimental setup were constructed within the frame of this work and thus are briefly described in the present contribution