Durgam Vigyan Sansthana

Learn To Converge Your Dreams with Durgam Vigyan Sansthana Institute. The Scanning Electron Microscope An SEM is a high essentially magnification microscope, which uses a focused scanned micron and submicron ranges. SEM generates high-energy electrons and focused on the specimen of the electron beam is scanned over the surface of the specimen in a motion similar to a television camera to produce a rasterized digital image. Electrons are speeded up in a vacuum until their wavelength is extremely short, only 100-1000 that of white light. Beams of these fast-moving electrons are focused on a sample and are absorbed or scattered by the specimen and electronically processed into an image. The primary electron beam interacts with the sample in several key ways as- The primary electron generates low-energy secondary electrons, which tend to emphasize the topographic nature of the specimen.  Primary electrons can be backscattered which produces images with a high degree of an atomic number...