The nominal value of the effective camera length of an electron microscope operating in the selected area mode is not sufficiently accurate for any calculations of lattice spacing. The actual value of camera length must be calibrated at the same accelerating voltage and objective lens setting by reference to a known substance with evaporated films of aluminum or thallous chloride. The very small crystallite size yields ring patterns suitable for calibration purposes. A chart with the principal lattice spacings is provided. Standard grid is 3.05mm 200 mesh copper.
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