Particles protruding over the edge of a hole are best for testing TEM high resolution performance. The evaporated gold forms small poly-crystalline islands and within these islands lattice fringes can be resolved. This specimen is also used to measure contamination rates in the electron microscope by noting the deposition rate of carbon within the holes of the gold film. S010 Combined TEM test specimen Price . Mounted on a 3mm copper grid.
Holes vary in size and the smallest holes are well suited for stigmating at medium powers.
The high power granularity of the thin edges is very suitable for stigmating at very high magnifications. The grids are coated with a formvar film and a light carbon coating on 400 mesh copper grids. They are supplied in gelatine capsules. This specimen makes stigmatism in the SEM obvious and the image is easily made astigmatic. Specify SEM for mounted version.