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- Nikolić, Dragan, 1968-
(författare)
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Autoionizing states and their relevance in electron-ion recombination
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Atomic physics plays an important role in determining the evolution stages in a wide range of laboratory and cosmic plasmas. Therefore, the main contribution to our ability to model, infer and control plasma sources is the knowledge of underlying atomic processes. Of particular importance are reliable low temperature dielectronic recombination (DR) rate coefficients.This thesis provides systematically calculated DR rate coefficients of lithium-like beryllium and sodium ions via ∆n = 0 doubly excited resonant states. The calculations are based on complex-scaled relativistic many-body perturbation theory in an all-order formulation within the single- and double-excitation coupled-cluster scheme, including radiative corrections.Comparison of DR resonance parameters (energy levels, autoionization widths, radiative transition probabilities and strengths) between our theoretical predictions and the heavy-ion storage rings experiments (CRYRING-Stockholm and TSRHeidelberg) shows good agreement.The intruder state problem is a principal obstacle for general application of the coupled-cluster formalism on doubly excited states. Thus, we have developed a technique designed to avoid the intruder state problem. It is based on a convenient partitioning of the Hilbert space and reformulation of the conventional set of pairequations. The general aspects of this development are discussed, and the effectiveness of its numerical implementation (within the non-relativistic framework) is selectively illustrated on autoionizing doubly excited states of helium.
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- Nikolić, Dragan, et al.
(författare)
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Dielectronic recombination resonances in Na8
- 2004
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - : The American Physical Society. - 1050-2947 .- 1094-1622. ; 70:6
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Tidskriftsartikel (refereegranskat)abstract
- The electron-ion recombination spectrum of the Li-like Na8+ ion in the energy range 0.0–0.5 eV is presented. Experimental results obtained by storage-ring techniques are compared with a calculated spectrum, based on a combination of relativistic many-body methods and complex rotation, and the agreement is found to be very good. The deviations between measured and calculated dielectronic recombination resonance energies are usually below about 2 meV with a maximum difference at 5.5 meV, while the theoretical cross sections deviate by at most 20% from the experiment. The recombination spectrum in the investigated energy region is determined by the 2pj7ℓj′ Rydberg manifold of dielectronic recombination resonances, comprising 61 states within half an eV above the ground state of Na8+. The theoretical resonance parameters of all contributing states are provided.
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- Nikolic, Dragan
(författare)
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Tre städer, två broar och ett museum : minne, politik och världsarv i Bosnien och Hercegovina
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The thesis deals with ritual remembrance ceremonies enacted in the three towns of Mostar, Jajce and Višegrad in BiH. The Old Bridge in Mostar, the Bridge over the Drina in Višegrad and the AVNOJ Museum in Jajce all carry a material presence that influences everyday life in these localities. Through ethnographic fieldwork, insights into local practices in relation to those World Heritage Sites are produced that show the meaning that is attached to them in a local, national, post-Yugoslav and international context: How are they used today, by whom and why, and how is UNESCO’s cultural policy adopted, valued and reinterpreted at the interface of a post-war context? Methodologically, the study is based on a phenomenological approach. This offers an analytical focus on the practice of agency – on the outcomes of agency rather than its causes – that stress the importance of experience instead of structures and patterns. Thus, the question that is brought to the fore is what cultural heritage and memory are doing. In short, this underlines the dimension of the tactical and referring to de Certeau’s uses of notion rather than the strategic when dealing with monuments and material cultural heritage. The thesis is based on a wide range of empirical material, including participant observations, field notes, interviews, newspaper reports, web portal reports and video-documentation. The three World Heritage Sites stand out as examples of different cultural processes. The Old Bridge in Mostar was supposed to embody peace and reconciliation on the part of the international community, but in actual fact became a monument that represented the division of the town at a local level. In Višegrad the bridge, against all intentions, stood out as a national, Serb memorial of victory over adversaries. In both towns the national dimension was crucial for maintaining the ethnic division. However, in Jajce the application to UNESCO engaged many parts of civil society and brought multiple dimensions of the past in contact with contemporary life in the town. Here a detailed ethnography could show how cultural heritage helps to define who has the right to remember and who is prevented from accessing the past. From this perspective, monuments stand out as malleable material that acquires meaning in relation to a wide range of events and actors.
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