Optical Microscope; • Scanning Electron Microscope (SEM ...
• Electron wave is a unique medium that can be used in imaging. By accelerating the electrons into high energy beam (via high voltage), the wavelength thus created is far shorter than white light. For example, for an electron beam produced from a 20 kV gun, the wavelength is only 1240.7/20,000 (eV) = 0.06 nm = 0.6 Å,
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A Guide to Debouncing
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www.sjsu.eduFeb 01, 2005 · The electron beam should have a circular cross section when it strikes the specimen however it is usually elliptical thus the stigmator acts to control this problem [1,4]. 5) Specimen Chamber: At the lower portion of the column the specimen stage and controls are located. The secondary electrons from the
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www.vcbio.science.ru.nlThe electron beam is focused by the electro-magnetic lenses (condenser lens, scan coils, stigmator coils and objective lens) and the apertures in the column to a tiny sharp spot. 1. Condenser lens The current in the condenser determines the diameter of the beam: a low current results in a small diameter, a higher current in a larger beam. A narrow