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Atomic processes in gaseous nebulae

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dc.contributor.advisor Smits, D.P. Prozesky, Andri 2012-02-07T06:21:43Z 2012-02-07T06:21:43Z 2011-05
dc.identifier.citation Prozesky, Andri (2011) Atomic processes in gaseous nebulae, University of South Africa, Pretoria, <> en
dc.description.abstract The atomic physics relevant to gaseous nebulae is critically examined using modelling software with particular emphasis on radio recombination lines (RRLs). The theoretical spectral line intensities can be deduced if we know the population structure of the bound electrons in the gas under non-thermal equilibrium conditions. The population structure of hydrogen is solved for various environments using a capture-collision-cascade model that incorporates an ambient radiation eld. The validity of assuming Case B (Baker & Menzel, 1938) for nebulae is investigated. It is known that Case B is appropriate for levels with small principal quantum numbers (n < 40), but this assumption is re-examined for high levels which are relevant to RRLs. E ects of an ambient radiation eld on the population structure is examined and processes that are stimulated by a radiation eld are included in the model. This is done as a preliminary investigation to extend the model to a photoionization code. en
dc.format.extent 1 online resource (67 leaves)
dc.language.iso en en
dc.subject Atomic data en
dc.subject Atomic process en
dc.subject Plasmas en
dc.subject ISM atoms en
dc.subject.ddc 530.11350113
dc.subject.lcsh Atoms -- Computer simulation
dc.subject.lcsh Radiative transfer
dc.subject.lcsh Nebulae -- Computer simulation
dc.subject.lcsh Astrophysics -- Computer simulation
dc.subject.lcsh Radio recombination lines
dc.title Atomic processes in gaseous nebulae en
dc.type Dissertation en
dc.description.department Physics (M. Sc. (Astronomy)

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