immersion electron microscope

immersion electron microscope

[ə′mər·zhən i¦lek‚trän ′mī·krə‚skōp]
(electronics)
An emission electron microscope in which the specimen is a flat conducting surface which may be heated, illuminated, or bombarded by high-velocity electrons or ions so as to emit low-velocity thermionic, photo-, or secondary electrons; these are accelerated to a high velocity in an immersion objective or cathode lens and imaged as in a transmission electron microscope.