| http://www.w3.org/ns/prov#value | - ent of FIGS. 19-19B, biasing of the aperture plate is accomplished by forming it of an insulating material such as boron nitride, coating the exterior and interior surfaces which are exposed to the ions with an electrically conductive material such as graphite, and electrically biasing the conductor. [0248] In other embodiments insula
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