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Do the electrons strike the photocathode?

  1. Jan 17, 2009 #1


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    Do the electrons strike the photocathode???

    Suppose the followig situation:
    The electrons emit from the photocathode (grounded), then instead of striking a dynode or something, some of these electrons go back into the photoathde (for example under the influence of an electric field) and also suppose that the energy of the electrons in not very high, what will happen then? Can the electrons strike the photocathde or they'll be repelled because of the field produced by electrons on the photocathode?

    Thanks for any help you may be able to give
  2. jcsd
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