Department of Physics and Astronomy: Publications and Other Research
Date of this Version
March 1992
Abstract
The purpose of this chapter is to review the use of the adiabatic hyperspherical approximation for the quantitative calculation of single- and multiphoton cross sections of two-electron systems. In Section 2 we provide a brief general orientation to the hyperspherical coordinate representation, the adiabatic approximation, and a diabatic approximation for treating strongly avoided crossings between adiabatic potential curves. In Section 3 we review applications to photoionization and photodetachment processes in He, Be, H–, and Ps–. In Section 4 we review applications to multiphoton processes in H–. Finally, in Section 5 we assess the adiabatic hyperspherical approximation and discuss future prospects for going beyond this approximation.
Comments
Chapter to appear in Many-Body Theory of Atomic Structure and Photoionization, edited by Tu-nan Chang (World Scientific Publishing Co., Singapore, 1992). Copyright © 1992 World Scientific Publishing Co. Used by permission.