Low Temperature Specimen Method for Electron Diffraction and Electron Microscopy

Physics

Scientific paper

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Scientific paper

Techniques of low temperature specimen method for electron diffraction and electron microscopy were developed. Convenient low temperature specimen holders were constructed with a sufficient number of freedoms to adjust specimen settings for various observations. The temperature of specimen support could be varied within a range from liquid nitrogen temperature to +200°C. Contaminations of specimen caused by condensation of residual vapours, which usually occur considerably below -80°C, were practically eliminated by improving the vacuum of the apparatus and by the use of a special shield around specimen. Results of preliminary studies on ice and mercury were briefly described: For ice, the contribution of hydrogen atoms to the diffraction pattern of ice was recognized; for mercury, the solid-liquid phase transition was studied by electron diffraction and the growth of hair-like mercury crystallites was observed by electron microscopy.

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