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cross section of an electron microscope click to hear : cross section of an electron microscope

Electron microscope: it uses an electron beam (as opposed to light) to provide magnification that is markedly superior to that of an optical microscope.
cross section of an electron microscope image
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See cross section of an electron microscope in : french | spanish
stage aperture diaphragm aperture changer condenser vacuum manifold electron gun vacuum chamber visual transmission focusing lenses beam diameter reduction electron beam positioning electron beam

stage click to hear : stage

Adjustable metal plate (stage) on which the specimen is mounted in order to study it.

aperture diaphragm click to hear : aperture diaphragm

Device with an opening whose diameter can be changed to narrow or widen the diameter of the electron beam.

aperture changer click to hear : aperture changer

Device that adjusts the diaphragm opening in order to change the diameter of the beam.

condenser click to hear : condenser

System of magnetic lenses (electromagnets producing a magnetic field when excited by an electric current) that concentrates the beam onto the specimen under study.

vacuum manifold click to hear : vacuum manifold

Conduit connected to a pump that creates enough of a vacuum in the microscope that it can function.

electron gun click to hear : electron gun

Device that usually consists of a tungsten filament that is heated to produce an intense electron beam, which illuminates the specimen.

vacuum chamber click to hear : vacuum chamber

Part of the microscope in which pressure can be reduced so that the electrons can move.

visual transmission click to hear : visual transmission

The electron beam explores the surface of the specimen, which in turn emits electrons to form a point-by-point image on the screen.

focusing lenses click to hear : focusing lenses

System of magnetic lenses (electromagnets) that concentrate the electron beam on one spot on the specimen.

beam diameter reduction click to hear : beam diameter reduction

The two lenses of the condenser cause the divergent electron beam emitted by the gun to converge.

electron beam positioning click to hear : electron beam positioning

Control that positions the electron beam along the optical axis so that it reaches the specimen.

electron beam click to hear : electron beam

Set of negatively charged particles that propagate toward the specimen.