Research Papers in Physics and Astronomy


Date of this Version

August 1982


Published in PHYSICS OF ELECTRONIC AND ATOMIC COLLISIONS, S. Datz, editor. Copyright © 1982 North-Holland Publishing Company. Used by permission.


Two formulations for describing electronic excitations developed by Fano and his school are reviewed. The transition matrix formulation of atomic photoionization has provided new perspectives on the well-known random phase approximation and on its relation to configuration interaction. The hyperspherical coordinate approach to two electron states and collision processes has provided new perspectives on the classification of two-electron excitation channels and on the evolution of highly excited electronic states.

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