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Feickert, Carl Arthur 2015-05-13T15:41:35Z 2015-05-13T15:41:35Z 10000-01-01 1983 1983 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. Made available in DSpace on 2015-05-13T15:41:35Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8309940.PDF: 3591011 bytes, checksum: 4b6d753ccb6d1f2fc212c8eb3eb7a10e (MD5) Previous issue date: 1983 Embargo set by: Seth Robbins for item 78561 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 131 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983. http://hdl.handle.net/2142/77350 (UMI)AAI8309940 eng Physics, Astronomy and Astrophysics Charge Transfer Cross-Sections for Nitrogen(v) and Sulfur(iii) Ions Interacting With Hydrogen Atoms in Astrophysical Plasmas text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.