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Coincidence Studies of Electron and Photon Impact Ionization : Physics of Atoms and Molecules - Colm T. Whelan

Coincidence Studies of Electron and Photon Impact Ionization

Physics of Atoms and Molecules

By: Colm T. Whelan (Editor), H. R. J. Walters (Editor)


Published: 31st October 1997
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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.

Recent Absolute (e,2e) Measurements on Atomic Hydrogen and Helium at Low and Intermediate Energiesp. 1
Second Born Calculations of (e-2e) Cross Sections at Low Energy Using a Pseudostate Setp. 11
Excitation-Ionization and Excitation-Autoionization of Heliump. 21
An Analytical Approach to Resonant and Direct Fragmentation of Many-Body Coulomb Systemsp. 45
Ionization Dynamics and Exchange Effects in Pure Three-Body Coulomb Scatteringp. 57
Analysis of Integrated Cross Sections and Spin Asymmetries for the Electron-Impact Ionization of One- and Two-Electron Atomic Systemsp. 65
Double Ionization Mechanisms from Triple Coincidence Experimentsp. 71
Double Ionization of Helium by Electron Impact: A Study of the Two-Step Mechanismp. 77
Partitioning of Momentum in Electron-Impact Double Ionizationp. 85
5DCS and 4DCS Calculations for Symmetric (e,3e) Impact Ionizationp. 93
Exact and Approximate Methods of the Rigorous Coulomb Scattering Theoryp. 101
Strong and Weak Statements in the Theory of Dipolar (e,2e) Impact Ionizationp. 109
The Triple Differential Cross Sections for ([gamma],2e) in Helium at Intermediate Energiesp. 115
Total and Single Differential Cross Sections for He Double Photoionization Calculated by the CCC Methodp. 121
From ([gamma],2e) to ([gamma],eR): Kinematically Complete Experiments with COLTRIMSp. 127
Angle Resolved Electron Energy Loss Study on the Inner Shell Excited States of Nep. 137
Circular Dichroism in Double-Photoionization of Helium Studied by Electron Time-of-Flight Coincidence Spectroscopyp. 145
Interference Effects in Argon Auger Coincidence Spectrap. 155
Triple Differential Cross Sections for Electron Impact Ionization of Argon between 50 eV and 215.8 eVp. 163
Multiple Scattering Effects in High-Energy Electron Molecule Ionization of H[subscript 2]p. 169
Parametrisation of TDCS in a Planep. 179
An Explanation of the Structure Observed in Out-of-Plane Symmetric Measurements on Heliump. 185
On the Addition Theorem for Jacobi Polynomialsp. 195
Progress Report on Relativistic (e,2e) Processesp. 199
Structure of the Triply Differential Cross Section in the Recoil Region in Relativistic Electron Impact Ionizationp. 207
Coulomb Boundary Conditions for Relativistic (e,2e) Processesp. 215
Spin Effects in the (e,2e) Cross Sections of Xenonp. 221
Measurements of Spin Polarized (e,2e) Processes at 54.4 eVp. 231
Is There Any New Physics in Spin Dependent (e,2e) Collisions?p. 239
Electron-Momentum Spectroscopy of Solids by the (e,2e) Reactionp. 249
Valence Band Reconstructions in Graphite by Grazing Incidence (e,2e) Spectroscopyp. 261
Energy Distribution of Correlated Electron Pairs Excited by Low Energy Electrons from W(001) Measured by a Time-of-Flight (e,2e) Spectrometerp. 271
Electron Impact Ionization of Hydrogenic Ions in Asymmetric Geometriesp. 279
Bethe-Ridge Effects in (e,2e) on H- (Using 6DIME)p. 287
The Ehrhardt Prizes 1996p. 297
Three-Body Models of Electron-Hydrogen Ionizationp. 299
The Normalisation of the Experimental Triple Differential Cross Section of Noble Gas Atoms in Extreme Asymmetric Geometryp. 305
Indexp. 319
Table of Contents provided by Blackwell. All Rights Reserved.

ISBN: 9780306456893
ISBN-10: 0306456893
Series: Physics of Atoms and Molecules
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 322
Published: 31st October 1997
Publisher: Springer Science+Business Media
Country of Publication: US
Dimensions (cm): 23.4 x 15.6  x 1.91
Weight (kg): 1.44