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Why go through the trouble of trapping radium atoms? Because it might provide a chance to detect a violation of time-reversal symmetry (abbreviated with the letter T), which would manifest itself as an electric dipole moment; that is, even though the atom as a whole is charge neutral, there might exist a slight offset between the negative and positive charge within the atom along its spin axis.
www-mep.phy.anl.gov...
www.aip.org...