Date Awarded


Document Type


Degree Name

Doctor of Philosophy (Ph.D.)




In this thesis a general theory of electron detachment in slow collisions of negative ions with atoms is presented. The theory is based upon a semiclassical close-coupling framework, following the work of Taylor and Delos. The Schrodinger equation is reduced, under certain assumptions, to a non-denumerably infinite set of coupled equations. We develop a new method for solving these equations that is more general than the methods used by Taylor and Delos. A zero-order approximation of our solution is applied to the case of H('-)(D('-)) on Ne collisions, the results are compared with the experimental data, and we find good agreement between theory and experiment, particularly with regard to the isotope effect. A first-order approximation of the solution is proved to be very close to the exact solution, and it is applied to the case of H('-)(D('-)) on He collisions. We use quadratic and quartic approximations for the energy gap (DELTA)(t) to calculate, among other things, the survival probability and electron energy spectrum. There are some interesting results for the electron energy spectrum which have not yet been observed in experiments.



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