Precise low angle rotary shadowing with heavy metals (like platinum) can be used in transmission electron microscopy (TEM
) to observe molecular details of objects previously absorbed on a thin, low grain and electron-transparent carbon film.
To achieve the highest contrast and better image quality, it is essential that the coating is directional, and it is given at a precise angle toward the sample. The fine grain of the metal layers and the homogeneous thickness of the coating material all over the sample surface are also crucial requirements to achieve high quality TEM
images. This requires the method of e-beam evaporation a stream of evaporated material which is very directional, extremely homogeneous, cool and fine grained.