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|Title:||Charge Transfer Cross-Sections for Nitrogen(v) and Sulfur(iii) Ions Interacting With Hydrogen Atoms in Astrophysical Plasmas|
|Author(s):||Feickert, Carl Arthur|
|Department / Program:||Physics|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Subject(s):||Physics, Astronomy and Astrophysics|
|Abstract:||In the past decade, the important role of charge exchange in astrophysical plasmas has become firmly established following the initial work of Williams (1973), Steigman (1975) and others. However for multiply charged ions of astrophysical importance, reliable experimental values for the reactive cross sections involving neutral hydrogen and helium are not generally available. In the absence of such values, one must rely on theoretical calculations of the relevant reaction rates.
In this thesis, standard scattering theory formalisms are set forth, by which reactive cross sections may be deduced, given the required molecular potentials. In addition, two bases for the representation of the molecular wavefunctions are described along with a simple, semiclassical, analytic approximation to the reactive cross section. This development is continued by rendering these analytic formalisms, for the S('+2)-H and N('+4)-H systems, into quantitative reactive cross sections through the numerical solution of the scattering equations in an appropriate basis. Simple interpretations of the qualitative features of these calculations are then possible and their astrophysical relevance reviewed, with particular attention to the limitations of semiclassical methods utilized by previous investigators of these systems.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983.
|Date Available in IDEALS:||2015-05-13|