[en] The mechanism of creation of inverse population of electron configuration levels nd⁸(n+1)s₉² nd⁹(n+1)p in Cu⁺, Ar⁺, Cd²⁺ and Hg²⁺ is discussed. Upper levels nd⁸(1+1)s² are populated by a direct electron impact of the ground atomic state. De-excitation of these levels occurs due to transitions with low probability on the nd⁹(n+1)p level, as well as due to quenching of proper gas by atoms. Low levels belonging to the nd⁹(n+1)p configuration are populated by transitions from nd⁸(n+1)s² states as well as by a direct electron impact of the main atomic state. De-excitation occurs as a result of raiation transitions nd⁹(n+1)p-nd⁹(n+1)_s, nd¹⁰ with high probability. So, the population of nd⁸(n+1)s² and nd⁹(n+1) levels is due to the fact that the processes of population and de-excitation of low and high levels are similar, in rates these processes differ considerably, that leads to the creation of inverse population

[en] We address the question of coexistence of superconductivity and ferromagnetism. Using a field theoretical approach we study a one-fermion effective model of a ferromagnetic superconductor in which the quasiparticles responsible for the ferromagnetism form the Cooper pairs as well. For the first time we solve self-consistently the mean-field equations for the superconducting gap and the spontaneous magnetization. We discuss the physical features which are different in this model and the standard BCS model and consider their experimental consequences

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No abstract available

[en] The radiative lifetimes of excited Hg I nd ³D₂ (n = 7-11) states have been determined using two-photon excitation and time resolved fluorescence spectroscopy. The dependence of these data versus principal quantum number is discussed. (orig.)

[en] Radiative lifetimes of 7d, 8d ¹D₂ excited states of Hg I are measured using pulsed two-photon excitation from the ground [Xe]5d¹⁰6s²¹S₀ mercury state, detecting the decay of the laser-induced fluorescence. The results are compared with theoretical values, obtained by means of a Hartree-Fock single configuration method, taking into account electron configuration interaction. The radiative lifetime value dependence on the effective principal quantum number for the nd ¹D₂ series is analyzed and compared with the quantum defect dependence. (orig.)

[en] The present review is devoted to the excitation transfer in He-Ne collisions at thermal energies. Theoretical treatment of the He-Ne term structures is the background of the analyses of the available experimental data and the mechanism of the main reactions. The analyses allow to classify the results of the enormous number of experimental investigations and to point out the most reliable ones. The energy transfer in He (2^1,3S, 2^1,3P) - Ne collisions and processes in Ne^*-He collisions are the main content of the review. The energy dependence of the different process's cross sections as well as temperature dependence of the rate constants are also discussed. (orig.)

[en] In this work, laser-induced breakdown spectroscopy was applied to determining the elemental composition of a set of ancient bronze artefacts dated from the Late Bronze Age and Early Iron Age (14^th – 10^th century BC). We used a Nd:YAG laser at 1064 nm with pulse duration of 10 ns and energy of 10 mJ and determined the elemental composition of the bronze alloy that was used in manufacturing the samples under study. The concentrations of tin and lead in the bulk of the examined materials was estimated after generating calibration curves for a set of four standard samples. The preliminary results of the analysis will provide information on the artefacts provenance and on the production process. (paper)

[en] Full text: Radiative parameters for transitions depopulating the levels belonging to the 3d⁸ 4s² configuration of Cu II and to the 4d⁹6s and 4d⁹5d configurations of Ag II have been obtained both theoretically and experimentally. On the experimental side, a laser produced plasma was used as a source of Cu II and Ag II spectra. The light emitted by the laser-produced plasma was focused on the input slit of a grating monochromator coupled with a time-resolved optical multichannel analyzer system. Spectral response calibration of the experimental system was made using a deuterium lamp in the wavelength range from 200 to 400 nm, and a standard tungsten lamp in the range from 350 to 600 nm. The transition probabilities were obtained using measured branching ratios and available experimental data for the radiative lifetimes of the corresponding states. On the theoretical side, a relativistic Hartree-Fock approach including the most important relativistic effects as well as core-polarization effects was used for the calculations. Theory and experiment have been compared and compared also with previous results available in the literature. Possible explanations for some discrepancies observed when comparing theoretical and experimental results will be discussed during the meeting

[en] Laser-induced breakdown spectroscopy (LIBS) is an analytical technique for qualitative and quantitative elemental analysis of solids, liquids and gases. In this work, the method was applied for investigation of archaeological bronze objects. The analytical information obtained by LIBS was used for qualitative determination of the elements in the material used for manufacturing of the objects under study. Quantitative chemical analysis was also performed after generating calibration curves with standard samples of similar matrix composition. Quantitative estimation of the elemental concentration of the bulk of the samples was performed, together with investigation of the surface layer of the objects. The results of the quantitative analyses gave indications about the manufacturing process of the investigated objects. (paper)