Hardware
The TEAM is based on a commercial FEI Titan 80–300 electron microscope, which can be operated at voltages between 80 and 300 keV, both in TEM and STEM (that is scanning TEM) modes. To minimize the mechanical vibrations, the microscope is located in a separate room within a sound-proof enclosure and is operated remotely. The electron source is a Schottky type field emission gun with a relatively low energy spread of 0.8 eV at 300 keV. In order to reduce chromatic aberrations, this spread is further lowered to 0.13 eV at 300 keV and 0.08 eV at 80 kV using a Wien-filter type monochromator. Both the illumination lens, which is located above the sample and is conventionally called the condenser lens, and the collection lens (called the objective lens) are equipped with fifth-order spherical aberration correctors. The electrons are further energy filtered by a GIF filter and detected by a CCD camera. The filter makes it possible to select electrons scattered by specific chemical elements and so identify individual atoms in the sample being studied.
Read more about this topic: Transmission Electron Aberration-Corrected Microscope
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