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Electron Beam-Specimen Interactions and Simulation Methods in Microscopy (eBook)

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2018 | 1. Auflage
296 Seiten
Wiley (Verlag)
978-1-118-69655-2 (ISBN)

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Electron Beam-Specimen Interactions and Simulation Methods in Microscopy -  Budhika G. Mendis
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A detailed presentation of the physics of electron beam-specimen interactions Electron microscopy is one of the most widely used characterisation techniques in materials science, physics, chemistry, and the life sciences. This book examines the interactions between the electron beam and the specimen, the fundamental starting point for all electron microscopy. Detailed explanations are provided to help reinforce understanding, and new topics at the forefront of current research are presented. It provides readers with a deeper knowledge of the subject, particularly if they intend to simulate electron beam-specimen interactions as part of their research projects. The book covers the vast majority of commonly used electron microscopy techniques. Some of the more advanced topics (annular bright field and dopant atom imaging, atomic resolution chemical analysis, band gap measurements) provide additional value, especially for readers who have access to advanced instrumentation, such as aberration-corrected and monochromated microscopes. Electron Beam-Specimen Interactions and Simulation Methods in Microscopy offers enlightening coverage of: the Monte-Carlo Method; Multislice Simulations; Bloch Waves in Conventional and Analytical Transmission Electron Microscopy; Bloch Waves in Scanning Transmission Electron Microscopy; Low Energy Loss and Core Loss EELS. It also supplements each chapter with clear diagrams and provides appendices at the end of the book to assist with the pre-requisites. A detailed presentation of the physics of electron beam-specimen interactions Each chapter first discusses the background physics before moving onto simulation methods Uses computer programs to simulate electron beam-specimen interactions (presented in the form of case studies) Includes hot topics brought to light due to advances in instrumentation (particularly aberration-corrected and monochromated microscopes) Electron Beam-Specimen Interactions and Simulation Methods in Microscopy benefits students undertaking higher education degrees, practicing electron microscopists who wish to learn more about their subject, and researchers who wish to obtain a deeper understanding of the subject matter for their own work.

BUDHIKA G. MENDIS, PhD, is Associate Professor at the Department of Physics, Durham University, UK, where he teaches electron microscopy at both undergraduate and postgraduate levels. He has over 15 years of experience in all the major electron microscopy techniques, including aberration-correction, and has used many of the simulation methods discussed in this book as part of his own research.

Preface ix

1 Introduction 1

1.1 Organisation and Scope of the Book 3

References 8

2 The Monte Carlo Method 9

2.1 Physical Background and Implementation 11

2.1.1 Elastic Scattering By an Atomic Nucleus 11

2.1.2 Inelastic Scattering by Atomic Electrons 18

2.1.3 Implementation of the Monte Carlo Algorithm 23

2.2 Some Applications of the Monte Carlo Method 27

2.2.1 Spatial Resolution and Backscattered Imaging 27

2.2.2 Characteristic X-Ray Generation 34

2.2.3 Cathodoluminescence and Electron Beam Induced Current Microscopy 37

2.3 Further Topics in Monte Carlo Simulations 40

2.3.1 Classical or Quantum Physics? 40

2.3.2 Spin-Orbit Coupling and the Mott Cross-Section 43

2.3.3 Dielectric Model of Stopping Power and Secondary Electron Emission 46

2.4 Summary 49

References 50

3 Multislice Method 53

3.1 Mathematical Treatment of the Multislice Method 56

3.1.1 Specimen Transmission Function 59

3.1.2 Fresnel Propagator Function 66

3.1.3 Objective Lens Contrast Transfer Function and Partial Coherence 71

3.1.4 Implementation of the Multislice Algorithm 76

3.2 Applications of Multislice Simulations 78

3.2.1 HREM Imaging and Electron Crystallography 78

3.2.2 CBED and STEM Applications: Frozen Phonon Model 87

3.3 Further Topics in Multislice Simulation 93

3.3.1 Accuracy of Multislice Algorithms 93

3.3.2 Is the Frozen Phonon Model Physically Realistic? 97

3.4 Summary 102

References 102

4 Bloch Waves 105

4.1 Basic Principles 106

4.1.1 Mathematical Background 106

4.1.2 Application to Two-Beam Theory 111

4.1.3 Phenomenological Modelling of Thermal Diffuse Scattering 116

4.1.4 Bloch States in Zone-Axis Orientations 124

4.2 Applications of Bloch Wave Theory 132

4.2.1 HREM Imaging 132

4.2.2 HAADF Imaging 134

4.2.3 Bloch Wave Scattering By Elastic Strain Fields 144

4.3 Further Topics in Bloch Waves 149

4.3.1 Dopant Atom Imaging in STEM 149

4.3.2 Electron Channelling and Its Uses 156

4.4 Summary 160

References 161

5 Single Electron Inelastic Scattering 165

5.1 Fundamentals of Inelastic Scattering 166

5.1.1 Electron Excitation in a Single Atom by a Plane Wave 166

5.1.2 Mixed Dynamic Form Factor 180

5.1.3 Yoshioka Equations and Inelastic Scattering within a Crystal 189

5.1.4 Coherence in Inelastic Scattering 195

5.2 Fine Structure of The Electron Energy Loss Signal 201

5.2.1 Origin of Fine Structure 201

5.2.2 Core Hole Effects 206

5.2.3 Magnetic Circular Dichroism 209

5.3 Summary 211

References 212

6 Electrodynamic Theory of Inelastic Scattering 215

6.1 Bulk and Surface Energy Loss 216

6.1.1 Energy Loss in an 'Infinite' Solid 216

6.1.2 Phonon Spectroscopy 226

6.1.3 Interface and Surface Contributions 232

6.2 Radiative Phenomena 244

6.2.1 Cerenkov Radiation and Band Gap Measurement 244

6.2.2 Transition Radiation 249

6.3 Simulating Low Energy Loss EELS Spectra 253

6.3.1 Discrete Dipole Approximation (DDA) 253

6.3.2 Boundary Element Method (BEM) 254

6.4 Summary 259

References 259

Appendix A The First Born Approximation and Atom Scattering Factor 263

Appendix B Potential for an 'Infinite' Perfect Crystal 267

Appendix C The Transition Matrix Element in the One Electron Approximation 269

Appendix D Bulk Energy Loss in the Retarded Regime 271

Index 275

Erscheint lt. Verlag 16.3.2018
Reihe/Serie RMS - Royal Microscopical Society
RMS - Royal Microscopical Society
Sprache englisch
Themenwelt Naturwissenschaften Chemie
Technik Maschinenbau
Schlagworte Chemie • Chemistry • Festkörperphysik • materials characterization • Materials Science • Materialwissenschaften • Microscopy • Mikroskopie • Physics • Physik • Solid state physics • Werkstoffprüfung
ISBN-10 1-118-69655-7 / 1118696557
ISBN-13 978-1-118-69655-2 / 9781118696552
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