Leaf of corrections inserted before back end-paper. / Bibliography: p. 204-219. / xiv, 219 p. : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This study investigates the non-adiabatic behaviour of diatomic molecular systems having overlapping potential curves, especially the predissociation of NaI by the ionic-covalent crossing. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics and Mathematical Physics, 1996