Contributors |
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ix | |
Preface |
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xi | |
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1 Introduction to strain characterization methods in Transmission Electron Microscopy |
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1 | (38) |
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1 Direct strain characterization methods |
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2 | (18) |
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1.1 Origin of direct strain characterization in a TEM |
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2 | (2) |
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1.2 Quantitative characterization of strain as a property of matter |
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4 | (1) |
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1.3 Development of direct strain characterization techniques |
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5 | (14) |
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1.4 Inherent limit of direct strain characterization method |
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19 | (1) |
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2 Indirect strain characterization methods |
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20 | (12) |
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2.1 Nano Beam Electron (Precession) Electron Diffraction (NB(P)ED) |
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20 | (4) |
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24 | (8) |
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3 Conclusions of the chapter |
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32 | (1) |
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33 | (6) |
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2 Moire sampling in Scanning Transmission Electron Microscopy |
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39 | (40) |
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1 Signal sampling and recovery |
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40 | (18) |
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1.1 Discrete evaluation of a continuous function |
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40 | (2) |
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1.2 Recovery of a bandwidth limited function |
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42 | (6) |
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1.3 Recovery of an undersampled sparse periodic bandwidth limited function |
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48 | (10) |
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58 | (9) |
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2.1 2D sampling of a single crystal material |
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59 | (3) |
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2.2 High Resolution STEM imaging |
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62 | (1) |
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2.3 STEM Moire interferometry (STEM Moire sampling) |
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63 | (4) |
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3 Recovery of the crystal lattices from a STEM Moire hologram |
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67 | (8) |
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3.1 STEM Moire hologram formation in Fourier space |
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68 | (1) |
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3.2 Consideration of strain and sparsity |
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69 | (2) |
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3.3 Determination of the sampling vectors for each Moire wave vector |
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71 | (1) |
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3.4 Application of the recovery process |
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72 | (3) |
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4 Conclusions of the chapter |
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75 | (1) |
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76 | (3) |
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3 Scanning Transmission Electron Microscopy Moire sampling Geometrical Phase Analysis (STEM Moire GPA) |
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79 | (54) |
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1 Introduction of STEM Moire GPA |
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80 | (8) |
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1.1 2D strain field from a STEM Moire hologram |
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81 | (3) |
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1.2 Implementation of STEM Moire GPA |
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84 | (4) |
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88 | (5) |
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88 | (1) |
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89 | (1) |
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90 | (2) |
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92 | (1) |
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3 Strain characterization results on the calibrated sample |
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93 | (13) |
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93 | (3) |
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3.2 GPA on reconstructed electron micrograph (REC-GPA) |
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96 | (5) |
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101 | (3) |
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104 | (2) |
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4 Experimental considerations of STEM Moire GPA |
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106 | (14) |
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4.1 Effect of the pixel spacing |
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107 | (5) |
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4.2 Effect of the scanning rotation |
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112 | (3) |
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115 | (1) |
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4.4 Design of the SMG experimental protocol |
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116 | (4) |
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5 Application of the SMG protocol on the calibration sample |
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120 | (5) |
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5.1 Determination of suitable sampling ranges |
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121 | (1) |
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5.2 Comparison of SMG results using different sampling parameters |
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122 | (1) |
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122 | (3) |
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6 Conclusions of the chapter |
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125 | (1) |
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Appendix 3.A Analytical bi-axial fully strained model |
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126 | (4) |
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3.A.1 Bi-axial fully strained model and Hook's law |
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126 | (1) |
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3.A.2 Expression of the strain tensor with the lattice mismatch |
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127 | (1) |
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3.A.3 Transformation from base B0 to B1 |
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128 | (2) |
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3.A.4 Hook's law in the base B1 |
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130 | (1) |
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130 | (3) |
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4 Performance of Scanning Transmission Electron Microscopy Moire Sampling Geometrical Phase Analysis |
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133 | (54) |
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1 Qualitative assessment of accuracy |
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134 | (27) |
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1.1 SMG comparison with Dark-Field Electron Holography (DFEH) |
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135 | (4) |
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1.2 FEM strain distribution simulation |
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139 | (15) |
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1.3 Comparison between FEM simulation and experimental results |
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154 | (6) |
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1.4 Conclusions on the SMG accuracy |
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160 | (1) |
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2 Qualitative assessment of resolution and precision |
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161 | (15) |
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2.1 Link between resolution and precision in GPA |
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162 | (8) |
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170 | (6) |
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2.3 Conclusions on the resolution and precision of SMG |
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176 | (1) |
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3 Limits of STEM Moire GPA |
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176 | (6) |
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177 | (2) |
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179 | (3) |
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4 Conclusions of the chapter |
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182 | (1) |
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183 | (4) |
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5 Applications of Scanning Transmission Electron Microscopy Moire Sampling Geometrical Phase Analysis |
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187 | (24) |
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1 Basic application of SMG |
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188 | (12) |
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188 | (2) |
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190 | (2) |
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192 | (4) |
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1.4 Qualitative STEM Moire interferometry |
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196 | (4) |
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2 Strategic application of SMG |
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200 | (8) |
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200 | (2) |
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2.2 Large FOV SMG strain maps to maximize sensitivity |
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202 | (2) |
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2.3 Strategy to limit the contribution of the periodic patterned noise |
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204 | (4) |
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3 Conclusions of the chapter |
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208 | (1) |
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209 | (2) |
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6 Quasi-analytical modelling of charged particle ensembles in neutral gas flow and electric fields |
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211 | (18) |
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1 Introduction and the problem statement |
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211 | (2) |
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2 The case of constant velocities |
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213 | (3) |
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3 The case of variable velocities |
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216 | (1) |
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217 | (1) |
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5 Space charge contribution |
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218 | (8) |
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226 | (1) |
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227 | (2) |
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7 Superconducting electron lenses |
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229 | (36) |
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229 | (2) |
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2 Superconducting materials |
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231 | (6) |
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231 | (1) |
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2.2 High field, high current superconductors |
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232 | (5) |
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3 The design of magnetic electron lenses |
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237 | (6) |
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237 | (2) |
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3.2 Assessment of objective lens designs |
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239 | (4) |
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4 Superconducting electron lenses |
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243 | (18) |
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4.1 Lenses without pole pieces |
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243 | (9) |
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4.2 Lenses with pole pieces |
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252 | (9) |
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261 | (2) |
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5.1 Future prospects in electron microscopy |
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261 | (2) |
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263 | (1) |
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263 | (2) |
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8 Lorentz microscopy or electron phase microscopy of magnetic objects |
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265 | (58) |
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266 | (6) |
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266 | (2) |
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1.2 Notions of resolution |
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268 | (1) |
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1.3 Notions of image formation |
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269 | (3) |
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2 The interaction of an electron with a magnetic field |
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272 | (13) |
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2.1 The classical Lorentz force |
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272 | (1) |
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2.2 The semi-classical approximation to the Schrodinger equation |
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273 | (2) |
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2.3 The magnetic phase object |
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275 | (3) |
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2.4 The Aharanov and Bohm effect |
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278 | (7) |
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3 Calculation of the image intensity |
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285 | (9) |
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3.1 The Huygens-Fresnel principle |
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285 | (1) |
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3.2 Kirchhoff diffraction integral |
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286 | (1) |
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3.3 The diffraction theory |
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286 | (1) |
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3.4 Fraunhofer and Fresnel diffraction |
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287 | (3) |
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3.5 The stationary phase approximation to the diffraction integral |
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290 | (1) |
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3.6 The classical intensity |
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290 | (1) |
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3.7 Comparison of different results |
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291 | (1) |
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3.8 Reduced parameters in the image intensity equations |
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292 | (2) |
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4 Validity criteria for the pseudo-classical approximations |
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294 | (18) |
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4.1 Generalities on the correspondence limits of wave optics and wave mechanics |
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294 | (3) |
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297 | (1) |
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4.3 The generalized criterion |
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298 | (9) |
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4.4 Physical manifestations of the fluxon |
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307 | (5) |
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312 | (6) |
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312 | (2) |
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5.2 Application to small deflections |
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314 | (1) |
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315 | (3) |
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6 Remarks on domain wall measurements |
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318 | (2) |
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320 | (1) |
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321 | (1) |
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321 | (2) |
Index |
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323 | |