unipotential electrostatic lens

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unipotential electrostatic lens [¦yü·nə·pə′ten·chəl i¦lek·trə¦stad·ik ′lenz]

(electronics)

An electrostatic lens in which the focusing is produced by application of a single potential difference; in its simplest form it consists of three apertures of which the outer two are at a common potential, and the central aperture is at a different, generally lower, potential.

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