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Photomultiplier tube

  1. Apr 27, 2010 #1
    Why first photon emits two electrons in a photomultiplier tube? The interaction is one photon with one electron, am i right?
    Thanks in advance.
  2. jcsd
  3. Apr 27, 2010 #2

    Doc Al

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    Staff: Mentor

    The photoelectric effect is just the first step. That first emitted electron is then slammed into plates which causes several additional electrons to be emitted. (The latter effect is called secondary emission.)
  4. Apr 27, 2010 #3
    Thx Doc Al :)
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