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aberration absorption adjusted alpha particle amplitude angle anode aperture aperture stop arrangement astigmatism axis beta particle Bragg reflection Bravais lattices camera cathode collisions colour components condenser crystal diameter diffraction pattern diffusion pump direction distance electron beam emission emitted energy entrance pupil equation evaporation example exit pupil exposure eyepiece field filament film focal length focus focused fringes gas molecules give glass graticule illumination incident intensity ion pump ionisation gauge laser lattice layer lens lenses lines m"2 approx magnetic magnification mass maximum McLeod gauge measured mercury metal method monochromatic neutrons object obtained optical parallel particle particular phase photographic Pirani gauge plane plane-polarised plate position pressure prism produced protons radiation radioactive rays reflected refractive index rotated sample screen slit specimen spectrometer speed spherical aberration sputtering suitable surface techniques telescope thickness torr tube unit cell usually vacuum chamber vacuum system valve vapour vibration voltage wave front wavelength X-ray