Index 



161 



Electron wave optics, 16 



— waves, 22 



— waves in space, 23 



— waves, intensity of, 23 

 Electronic waves, de Broglie hy- 

 pothesis of, 2 



Electrons, elastic scattering of, 41 



— , incoherent scattered, 148 



— , inelastic scattering of, 42 



— , length of wave trains of. See 



Coherence length. 

 — , missing, 147 

 — , scattering of, 41 

 — , scattering of light and of, 128 

 Electrostatic field, 113 



— lens, 7 



— lens, powder of, 38 



— microscope, 29 



— potential, equivalent, 9 



— supermicroscope, 30 

 Elimination of lens astigmatism, 56 

 Ellipticity, field, 60 



Emission, auto-electric. See Cold 



emission. 

 — , coherent light, 20 

 — , cold, 26 



Equivalence theory, 146 

 Equivalent electrostatic potential, 9 

 Error, chromatic, 21, 44 

 — , diffraction, 132 

 — , resulting, 58 

 Externally illuminated objects, 142 



Feedback, negative, 74 

 Field, electrostatic, 113 



— ellipticity, 60 



— , lens effect of axially symmetri- 

 cal electric, 6 



— , magnetic, 113 



Figure, Airy, 144 



Fixed focus lens, 38 



Fluctuations of driving voltage, 56, 

 71 



Fluorescence microscopy, 48 



Focus, chromatic change of, Z7 



— of lens, fixed, 38 



— of lens, short, 108 



French electron microscope, 82 

 Fresnel diffraction patterns, 50 

 — diffraction. See Contour phe- 

 nomena. 

 Fringes, chromatic, 46 

 Future development of electron 

 microscope, 99 



Gaussian image. See Paraxial 



image. 

 Geometrical electron optics, 2, 4 

 Gun, electron, 34 



H 



Hamiltonian analogy between dy- 

 namics and optics, 2, 4 

 High-frequency-operated objec- 

 tives, 103 

 Homocentric wave, 18 

 Hyperspaces, 23 



Hypothesis of electronic waves, de 

 Broglie, 2 



I 



Illuminated objects, externally, 142 



Illuminating beam effect, Z7 



Illumination, critical, 146 



— , dark field, 19 



— , monochromatic, 21 



Image curvature, 11 



— distortion, 11 



— , Gaussian. See Paraxial image. 



— , paraxial, 10 



Images, origin of contrast in elec- 

 tron microscope, 40 



— , phase contrast, 53 



Improvements in uncorrected elec- 

 tron microscope, 99 



Incoherence,. 148 



Incoherent scattered electrons, 148 



Increasing lens strength, 100 



Indeterminacy, principle of, 104 



Index, definition of refractive, 6 



Inelastic scattering of electrons, 42> 



Influenza virus, 86 



