immersion lens
immersion lens
An electrostatic lens that has different potentials at the entrance and exit of the lens. The term of "immersion lens" originates from the immersion lens of light optical lenses, where the refraction index is different at the entrance and exit of the lens. The extraction electrode of the electron gun is an acceleration-type immersion lens. The Wien filter is normally a deceleration-type immersion lens. It is noted that lens action arises when electrons are accelerated or decelerated.
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