(Bilim, İlim) Taramalı Elektron Mikroskobunda (SEM) görüntü, yüksek voltaj ile hızlandırılmış elektronların numune üzerine odaklanması, bu elektron demetinin numune yüzeyinde taratılması sırasında elektron ve numune atomları arasında oluşan çeşitli girişimler sonucunda meydana gelen etkilerin uygun algılayıclarda toplanması ve sinyal güçlendiricilerinden geçirildikten sonra bir katot ışınları tüpünün ekranına aktarılmasıyla elde edilir.Modern sistemlerde bu algılayıcılardan gelen sinyaller dijital sinyallere çevrilip bilgisayar monitörüne verilmektedir
a technique that uses field emission of electrons or positive ions from the needle-shaped tip of an emitter to produce a magnified image of the emitter surface (showing each atom) on a fluorescent screen
A form of light microscopy in which small differences in refractive index of a transparent specimen are converted into amplitude (contrast) differences in the final image
(Bilim, İlim) The scanning electron microscope (SEM) is a type of electron microscope that creates various images by focusing a high energy beam of electrons onto the surface of a sample and detecting signals from the interaction of the incident electrons with the sample's surface
Scanning Probe Microscopy (SPM) is a branch of microscopy that forms images of surfaces using a physical probe that scans the specimen. An image of the surface is obtained by mechanically moving the probe in a raster scan of the specimen, line by line, and recording the probe-surface interaction as a function of position. SPM was founded with the invention of the scanning tunneling microscope in 1981
Microscopy involving use of an electron microscope.electron microscopist n. Technique that allows examination of samples too small to be seen with a light microscope. Electron beams have much smaller wavelengths than visible light and hence higher resolving power. To make them more observable, samples may be coated with metal atoms. Because electrons cannot travel very far in air, the electron beam and the sample must be kept in a vacuum. Two different instruments are used. In the scanning electron microscope, a moving beam of electrons is scanned across a sample; electrons scattered by the object are focused by magnetic "lenses" to produce an image of the object's surface similar to an image on a television screen. The images appear three-dimensional; they may be of small organisms or their parts, of molecules such as DNA, or even of large individual atoms (e.g., uranium, thorium). In the transmission electron microscope, the electron beam passes through a very thin, carefully prepared sample and is focused onto a screen or photographic plate to visualize the interior structure of such specimens as cells and tissues