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Encyclopedia > Photocathode

In an electron tube, a negatively charged electrode coated with a photosensitive compound. When struck by light, electrons are emitted.


Although a plain metallic cathode will exhibit photo properties to some extent, the coating increases the effect many fold.


  Results from FactBites:
 
Photocathode capable of detecting position of incident light in one or two dimensions, phototube, and photodetecting ... (7638 words)
A photocathode according to claim 1, wherein a material selected from the group consisting of an alkali metal, an alkali metal compound, an oxide of said alkali metal compound, and a fluoride of said alkali metal compound is coated on said first surface of said semiconductor layer.
In the multianode photomultiplier, crosstalk between the photocathode and the multiplier section, or between the multiplier section and the anode poses a problem, and the position resolution is not substantially improved.
1, this photocathode 1 is mounted in a vacuum vessel 21, and an anode 22 is arranged at a position opposing the photocathode 1.
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