Abstract
The electric dipole moments of elementary particles, atoms, molecules, and their connection to the electric susceptibility are discussed for stationary states. Assuming rotational invariance, it is emphasized that, for such states, only in the case of a parity and time-reversal-violating interaction can the considered particles exhibit a nonvanishing expectation value for the electric dipole moment.
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Rupertsberger, H. Electric dipole moments reconsidered. Found Phys 20, 1079–1089 (1990). https://doi.org/10.1007/BF00731853
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DOI: https://doi.org/10.1007/BF00731853