Tuesday, October 26, 2010

Transmission Electron Microscope

A transmission electron microscope is a microscope which transmits a beam of electrons through an ultra thin specimen, interacting with the specimen as it passes through. An image is formed from the interaction of the electrons transmitted through the specimen; the image is magnified and focused onto an imaging device, such as a fluorescent screen, on a layer of photographic film, or to be detected by a sensor such as a CCD camera.

Transmission electron microscopes use extremely thin (0.5 ┬Ám or less) samples illuminated by the electron beam. Images are recorded by detecting the electrons that pass though the sample to a system of electromagnetic lenses which focus and enlarge the image on the fluorescent screen, photographic film or digital camera. Magnifications beyond 1,000,000x are attainable with a transmission electron microscope.