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Transmission Electron Aberration-Corrected Microscope
Transmission Electron Aberration-Corrected Microscope (TEAM) is a collaborative research project between four US laboratories and two companies. It is based at the Lawrence Berkeley National Laboratory in Berkeley, California and involves Argonne National Laboratory, Oak Ridge National Laboratory and Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign, as well as FEI and CEOS companies, and is supported by the U.S. Department of Energy. The project's main activity is design and application of a transmission electron microscope (TEM) with a spatial resolution below 0.05 nanometers, which is roughly half the size of an atom of hydrogen.〔 The project was started in 2004; the operational microscope was built in 2008 and achieved the 0.05 nm resolution target in 2009. The microscope is a shared facility available to external users.
==Scientific background==
It has long been known that the best achievable spatial resolution of an optical microscope, that is the smallest feature it can observe, is of the order of the wavelength of the light λ, which is about 550 nm for green light. One route to improve this resolution is to use particles with smaller λ, such as high-energy electrons. Practical limitations set a convenient electron energy to 100–300 keV that corresponds to ''λ'' = 3.7–2.0 pm. Unfortunately, the resolution of electron microscopes is limited not by the electron wavelength, but by intrinsic imperfections of electron lenses. These are referred to as spherical and chromatic aberrations because of their similarity to aberrations in optical lenses. Those aberrations are reduced by installing in a microscope a set of specially designed auxiliary "lenses" which are called aberration correctors.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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