a microscope of extremely high power that uses beams of electrons focused by magnetic lenses instead of rays of light, the magnified image being formed on a fluorescent screen or recorded on a photographic plate: its magnification is substantially greater than that of any optical microscope.
a powerful type of microscope that uses electrons, rather than light, and electron lenses to produce a magnified image
electron microscope n.
Any of a class of microscopes that use electrons rather than visible light to produce magnified images, especially of objects having dimensions smaller than the wavelengths of visible light, with linear magnification approaching or exceeding one million (106).
A microscope that produces images of extremely small objects by using beams of electrons rather than visible light. Since electrons have a much shorter wavelength than light, the use of electron beams rather than light beams can resolve much finer structural details in the sample. Electrons are beamed at the sample and focused by magnets; a detector then converts the refracted or reflected beams into a black and white image. Powerful electron microscopes can create accurate images of objects as small as individual molecules. See also scanning electron microscope.
A device that uses electrons instead of light to form images of very small objects, such as individual parts of small living things.
- Electron model
electronics A model of semiconductor behaviour in which donors contribute the charge of an electron, and acceptors contribute a space for same, in effect contributing a fictional positive charge of similiar magnitude. Physicists use the electron model. Some language theorists consider language and the electron to be models in themselves. Contrast hole model. (1995-10-06)
noun, Electronics. 1. a vacuum tube containing a number of dynodes that serve to amplify the flow of electrons from the cathode by means of secondary emission. noun 1. (physics) a device for amplifying and measuring a flux of electrons. Each electron hits an anode surface and releases secondary electrons that are accelerated to a […]
[ih-lek-tron-noo-tree-noh, -nyoo-] /ɪˈlɛk trɒn nuˌtri noʊ, -nyu-/ noun, plural electron-neutrinos. Physics. 1. a type of neutrino that obeys a conservation law together with the electron, with the total number of electrons and electron-neutrinos minus the total number of their antiparticles remaining constant.
noun, (used with a singular verb) 1. the study and use of the physical and optical properties of beams of electrons under the influence of electric or magnetic fields. noun 1. (functioning as sing) the study and use of beams of electrons and of their deflection and focusing by electric and magnetic fields