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Magnetic Lenses Guide the Electrons<br />

A "light source" at the top of the microscope emits the electrons that travel through vacuum in<br />

the column of the microscope. Instead of glass lenses focusing the light in the light<br />

microscope, the TEM uses electromagnetic lenses to focus the electrons into a very thin beam.<br />

The electron beam then travels through the specimen you want to study. Depending on the<br />

density of the material present, some of the electrons are scattered and disappear from the<br />

beam. At the bottom of the microscope the unscattered electrons hit a fluorescent screen,<br />

which gives rise to a "shadow image" of the specimen with its different parts displayed in<br />

varied darkness according to their density. The image can be studied directly by the operator<br />

or photographed with a camera.<br />

7 Seznam adres :<br />

http://www.microscopy-uk.org.uk/primer/special.htm speciální mikroskop. techniky<br />

http://www.biomed.cas.cz/d331/vade/mikroskopy.html#h4_7 mikroskopy<br />

http://www.physics.muni.cz/~kubena/optika1/sld017.htm<br />

http://cheminfo.chemi.muni.cz/ianua/Konecna/Konecna_SP_JS01.html využití elektronové<br />

mikroskopie v AAS<br />

http://www.ujep.cz/ujep/pf/kbiol/web/elektronm.htm obrázek el. mikr. TESLA<br />

http://www.edlin.cz/fei/fei1.htm-TEM Morgagni(FEI)<br />

http://www.edlin.cz/fei/fei2.htm- SEM Quanta(FEI)<br />

http://www.tescan.cz/cz_prods.html#VEGA rast. el.m. VEGA

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