電界放出

field emission

[目次：照射系(電子銃／高圧系)]

適切な仕事関数を持つ材料（通常タングステン）を尖らせて作った陰極(エミッタ)を、引き出し電極で作られる強い電界中に置き、陰極の先端から電子を放出させること。

"Field emission" is a technique to emit electrons from the tip of the cathode. A sharpened cathode made of a material (normally, tungsten) that has an appropriate work function is placed in a strong electric field produced by the extraction electrode to emit electrons from the cathode tip.

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