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10 - Spin-resolved atomic (e,2e) processes

Published online by Cambridge University Press:  05 January 2013

By
Julian Lower  and
Colm T. Whelan
Edited by
Colm T. Whelan
Julian Lower
Affiliation:
Institut für Kernphysik
Colm T. Whelan
Affiliation:
Old Dominion University
Colm T. Whelan
Affiliation:
Old Dominion University, Virginia
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Summary

Introduction

The (e,2e) process for an atom describes an electron-impact-induced ionization event in which the momentum states of the incident and two outgoing electrons are defined, i.e., the reaction kinematics is fully specified. Due to its highly differential nature, the cross section describing this process provides a stringent test of electron-scattering theory. However, a quantum mechanically complete description of the (e,2e) process requires additional variables to be specified, namely the spin projection states of the continuum electrons, as well as angular momentum, and its projection state for the target atom before and the residual ion after the collision, respectively. While the goal of performing such a complete measurement is presently beyond experimental capabilities, (e,2e) experiments for which a subset of the quantum mechanical variables were determined have been performed. All employed beams of polarized electrons, enabling cross sections to be determined individually for the two spin states of the projectile (namely ms = ±½); others additionally resolved the angular momentum state of the target atom prior to the collision. In this chapter we will illustrate how the resolution of angular momentum states can powerfully highlight and provide new insight into specific aspects of the (e,2e) collision dynamics.

Electron spin emerges naturally from the relativistic treatment of quantum mechanics and, as a consequence, spin-resolved experiments are ideally suited to probe aspects of relativity in electron–atom scattering. Less obvious is that in the non-relativistic limit, spin-resolved measurements provide a sensitive probe to the nature of electron exchange processes in the (e,2e) ionization dynamics.

Type
Chapter
Information
Fragmentation Processes
Topics in Atomic and Molecular Physics
 , pp. 243 - 267
Publisher: Cambridge University Press
Print publication year: 2012

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References

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