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<p>In a SEM the signals result from interactions of the electron beam with atoms within the sample. The most common mode is to use the <a href="page.php?w=secondary_electrons">secondary electrons</a> (SE) to produce images. Secondary electrons have very low energies, on the order of 50 <a href="page.php?w=Electronvolt">eV</a>, which limits their <a href="page.php?w=Inelastic_mean_free_path">mean free path</a> in solid matter to a few <a href="page.php?w=nanometer">nanometer</a>s below the sample surface.  The electrons are detected by an <a href="page.php?w=Everhart-Thornley_detector">Everhart-Thornley detector</a>,</p><p>
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