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Au Test Objects
In the middle: 5 nanometer-sized crystals of gold are supported by a thin carbon film -- a little like beach balls on a trampoline. The atomic structure of the gold crystal can be viewed using the sub-Angstrom sized beam of electrons. A consequence of using such a small beam, is that the atoms become more visible. In small regions near the gold crystals, gold atoms are arranged in regular arrays. The patterns arranged around the image are indicate the regularity and orientation of these arrays. So, for instance, in the upper right, the pattern of six spots, arranged around the one central spot, tells us that the atoms near the gold crystal on the upper right, are arranged in a six-fold, or hexagonal, packing structure.
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