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Debye length for vacuum

  1. Jun 12, 2015 #1
    What is the correct value for the vacuum Debye screening length?
  2. jcsd
  3. Jun 12, 2015 #2


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    Can you cite a reference for the existence of "vacuum Debye screening length"?

    This term makes no sense, because, by definition, the screening length is caused by the presence of other charges (such as a plasma), meaning it is NOT a vacuum. One may consider the plasma to be in a vacuum background for calculation purposes, but this is far from being a vacuum.

  4. Jun 12, 2015 #3
    Thanks Zz for replying. I should have said "air vacuum" which is not the absolute vacuum, of course.
    My question is in fact related to a specific problem: The electrostatic potential of a dielectric spherical cavity due to point charge located within it. There are two solutions: one is for Debye length= 0 and one for otherwise. If the cavity is embedded in air\vacuum.. which solution should one consider?
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