出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/07/29 12:02 UTC 版)
A photocathode is a negatively charged electrode in a light detection device such as a photomultiplier or phototube that is coated with a photosensitive compound. When this is struck by a quantum of light (photon), the absorbed energy causes electron emission due to the photoelectric effect.