Atomic two-photon J0ex0ex=0ex0ex0↔J^'0ex0ex=0ex0ex1 transitions are forbidden for photons of the same energy. This selection rule is related to the fact that photons obey Bose-Einstein statistics. We have searched for small violations of this selection rule by studying transitions in atomic Ba. We set a limit on the probability v that photons are in exchange-antisymmetric states: v<1.2×10^-7.
No takes yet. Share an insight, caveat, or question.
DeMille et al. (1999) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: