Reading the answers to the question How do we know neutrons have no charge? I started a search for the electric dipole moment of atoms.
About molecules ist is clear, in some molecules an electron comes under the influence of a neighbor atom and we observe an electric dipole. My search for atomic electric dipoles was not successful.
Was an electric dipole ever observed. if yes, I’m curious how such a measurement should be carried out in a way, not inducing such a moment from the measurement instrument.