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No charge polarization on positronium in p-orbital state ?

  1. Feb 8, 2014 #1

    as I understand it, in hydrogen with its electron in the p-orbital there is a charge polarization (negative in the direction of the dumb-bell orbitals, positive in the other directions).
    Is this also the case for positronium in the p-orbital state ? I'd guess there cannot be any polarization, because the positron must always be on the opposite side as the electron (relative to their common center of mass). Is that right ?
  2. jcsd
  3. Feb 9, 2014 #2


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    If by charge polarization you mean electric dipole moment, then its nonzero for positronium in a p-state. Positive charge on one side, negative charge on the other, and the two particles are equidistant from their center of mass. That's an electric dipole.
  4. Feb 9, 2014 #3
    yes, electric dipole moment is the proper term i was looking for.
    Just to make sure I got it conceptually: So for hydrogen the negative charge is on the 2 "poles" and the positive charge is on the "equator", while for positronium there is one pole negative and one pole positive while the equator is neutral ?
    Last edited: Feb 9, 2014
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