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  6. Oriented Gold Crystal, 3.05mm grid Plane Spacing 0.204,0.144

Oriented Gold Crystal, 3.05mm grid Plane Spacing 0.204,0.144

51-1625-0187

Oriented single crystal gold foil on 3.05mm grid. Resolution, image quality, magnification and instrumental stability in higher resolution TEM's can be checked by setting up the conditions for imaging the 0.204nm (200 plane), 0.144nm (220 plane) and 0.102nm planar spacing in these specially prepared crystals.

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DESCRIPTION

Resolution, image quality, magnification and instrumental stability in higher resolution TEM's can be checked by setting up the conditions for imaging the 0.204nm (200 plane), 0.144nm (220 plane) and 0.102nm planar spacing in these specially prepared crystals. The tests are particularly recommended if height adjustments are made on the specimen stage. The gold foils are mounted on 3.05mm dia gold grids.

The evaporated gold is induced to grow in a (100) orientation. This gives lattice plane spacings of 0.204mm for the (200) planes and 0.143mm for the (220) planes. If the crystal thickness happens to be suitable, and if the objective aperture is large enough to accept the required diffracted beams, a spacing of 0.102mm can be imaged with a suitable focal setting. This specimen thus provides a valuable test for the best microscopes in service.

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