Ebook: Coincidence Studies of Electron and Photon Impact Ionization

The great advantage of coincidence measurements is that by suitable choice of the kinematical and geometrical arrangement one may probe delicate physical effects which would be swamped in less differential experiments. The measurement of the triple dif­ ferential and higher-order cross sections presents enormous technical difficulties, but refined experiments of this type provide an insight into the subtleties of the scattering process and offer a welcome, if severe, test of the available theoretical models. The last few years have been an exciting time to work in the field and much has been learned. Profound insights have been gleaned into the basic Coulomb few body problem in atomic physics: the experimental study of the fundamental (e,2e) processes on hydrogen and helium targets continues to add to our knowledge and indeed to challenge the best of our theoretical models; significant advances have been made in the understanding of the "double excitation problem," that is the study of ionization processes with two active target electrons: important measurements of (e,3e), (,),,2e), excitation-ionization and excitation autoionization have been reported and strides have been made in their theoretical description; the longstanding discrepancies between theory and experiment for relativistic (e,2e) processes were resolved, spin dependent effects predicted and ob­ served and the first successful coincidence experiments on surfaces and thin films were announced. Theory and experiment have advanced in close consort. The papers pre­ sented here cover the whole gambit of research in the field. Much has been achieved but much remains to be done.

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Content:
Front Matter....Pages i-ix
Recent Absolute (e,2e) Measurements on Atomic Hydrogen and Helium at Low and Intermediate Energies....Pages 1-10
Second Born Calculations of(e-2e) Cross Sections at Low Energy Using a Pseudostate Set....Pages 11-20
Excitation — Ionization and Excitation — Autoionization of Helium....Pages 21-43
An Analytical Approach to Resonant and Direct Fragmentation of Many-Body Coulomb Systems....Pages 45-55
Ionization Dynamics and Exchange Effects in Pure Three-Body Coulomb Scattering....Pages 57-63
Analysis of Integrated Cross Sections and Spin Asymmetries for the Electron-Impact Ionization of One- and Two-Electron Atomic Systems....Pages 65-69
Double Ionization Mechanisms from Triple Coincidence Experiments....Pages 71-75
Double Ionization of Helium by Electron Impact: A Study of the Two-Step Mechanism....Pages 77-83
Partitioning of Momentum in Electron-Impact Double Ionization....Pages 85-92
5DCS and 4DCS Calculations for Symmetric (e,3e) Impact Ionization....Pages 93-99
Exact and Approximate Methods of the Rigorous Coulomb Scattering Theory....Pages 101-108
Strong and Weak Statements in the Theory of Dipolar (e,2e) Impact Ionization....Pages 109-113
The Triple Differential Cross Sections for (?,2e) in Helium at Intermediate Energies....Pages 115-119
Total and Single Differential Cross Sections for He Double Photoionization Calculated by the CCC Method....Pages 121-125
From (?,2e) to (?,eR): Kinematically Complete Experiments with Coltrims....Pages 127-136
Angle Resolved Electron Energy Loss Study on the Inner Shell Excited States of Ne....Pages 137-143
Circular Dichroism in Double-Photoionization of Helium Studied by Electron Time-Of-Flight Coincidence Spectroscopy....Pages 145-153
Interference Effects in Argon Auger Coincidence Spectra....Pages 155-162
Triple Differential Cross Sections for Electron Impact Ionization of Argon between 50 eV and 215.8 eV....Pages 163-167
Parametrisation of TDCS in a Plane....Pages 169-178
An Explanation of the Structure Observed in Out-Of-Plane Symmetric Measurements on Helium....Pages 179-183
On the Addition Theorem for Jacobi Polynomials....Pages 185-193
Progress Report on Relativistic (e,2e) Processes....Pages 195-197
Structure of the Triply Differential Cross Section in the Recoil Region in Relativistic Electron Impact Ionization....Pages 199-206
Coulomb Boundary Conditions for Relativistic (e,2e) Processes....Pages 207-213
Spin Effects in the (e,2e) Cross Sections of Xenon....Pages 215-219
Measurements of Spin Polarized (e,2e) Processes at 54.4 eV....Pages 221-230
Is There Any New Physics in Spin Dependent (e,2e) Collisions?....Pages 231-237
Electron-Momentum Spectroscopy of Solids by the (e,2e) Reaction....Pages 239-248
Valence Band Reconstruction in Graphite by Grazing Incidence (e,2e) Spectroscopy....Pages 249-259
Energy Distribution of Correlated Electron Pairs Excited by Low Energy Electrons from W(001) Measured by a Time-Of-Flight (e,2e) Spectrometer....Pages 261-269
Electron Impact Ionization of Hydrogenic Ions in Asymmetric Geometries....Pages 271-278
Bethe-Ridge Effects in (e,2e) on H? (Using 6Dime)....Pages 279-285
Front Matter....Pages 287-295
Three-Body Models of Electron-Hydrogen Ionization....Pages 297-297
The Normalisation of the Experimental Triple Differential Cross Section of Noble Gas Atoms in Extreme Asymmetric Geometry....Pages 299-304
Back Matter....Pages 305-318
....Pages 319-322