= Environmental scanning electron microscope
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= ESEM
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A scanning <electron> microscope permitting a controlled gaseous specimen environment while maintaining the <electron> column at lower <pressure> by differential pumping. Ionization of the gas supplies positive <ions> that can neutralize negative specimen charging, and a suitable gaseous detector collects <electron> signals. This enables examination of some nonconducting uncoated specimens, with gas scattering and detector response included in interpretation.
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