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H SOME BASIC PRINCIPLES
HI USEFUL OPTICAL CONCEPTS
THE TRAJECTORY EQUATION
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accelerated anode aperture astigmatism axial axis C.R. tubes calculated cardinal points centre chromatic error coil constant converging crossover curl current density curvature curves cylinder cylinder lens decreases deflection depends derived determined diameter direction distance distortion diverging E.S. lenses effect electron beam electron lens electron microscope electron optics electron velocity electrostatic emitting energy equipotentials experimental Faraday cage field strength focal length focal properties focus focussed spot formula function further gabor gives glaser gradient height image plane immersion objective increase initial integral ions lens field limit magnetic field magnetic lenses magnification maloff and epstein method minimum modulator motion object and image paraxial path position potential distribution principal planes radial radius ramberg ray tracing refractive index region resolving power scherzer screen shows space charge spherical aberration spherical error surface symmetrical thin lens trajectory equation variation varies voltage ratio volts zero