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Cold FEG

Photonics Spectra
Oct 2010
JEOL USA Inc.Request Info
 
A new cold field emission gun (FEG) from JEOL USA Inc. enhances the ultrahigh atomic-level resolution of the company’s JEM-ARM200F aberration-corrected scanning/scanning transmission electron microscope. Now outfitted with the optional and field-retrofittable cold FEG, the JEM-ARM200F has ultrahigh imaging resolution that is guaranteed at 78 pm with an energy resolution of 0.3 eV. The higher brightness and smaller source size of the cold FEG produce a smaller, sharper electron probe with a larger probe current, resulting in enhanced atom-by-atom imaging and chemical analysis. The addition of a cold FEG to the ARM family adds another dimension to the company’s capability for atomic-scale imaging and characterization. This enhancement enables performance of subangstrom imaging and atomic column chemistry with accuracy, speed and ease.


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GLOSSARY
aberration
A departure from ideal paraxial imaging behavior. The distortion of an optical field wavefront as it is propagated through the elements of an optical system. The field distortion is due to the interaction of the wavefront with ideal components and therefore a result of optical component behavior.
microscope
An instrument consisting essentially of a tube 160 mm long, with an objective lens at the distant end and an eyepiece at the near end. The objective forms a real aerial image of the object in the focal plane of the eyepiece where it is observed by the eye. The overall magnifying power is equal to the linear magnification of the objective multiplied by the magnifying power of the eyepiece. The eyepiece can be replaced by a film to photograph the primary image, or a positive or negative relay...
resolution
1. In optics, the ability of a lens system to reproduce the points, lines and surfaces in an object as separate entities in the image. 2. The minimum adjustment increment effectively achievable by a positioning mechanism. 3. In image processing, the accuracy with which brightness, spatial parameters and frame rate are divided into discrete levels.
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