Exotic atom to weak, electromagnetic and gravitational forces, muonic atoms are governed to very high precision by the electromagnetic interaction. Since a muon is more massive than an electron, the Bohr orbits are closer to the nucleus in a muonic atom than in an ordinary atom, and corrections due to quantum electrodynamics are more important. Study of muonic atoms' energy levels as well as transition rates from excited states to the ground state therefore provide experimental tests of quantum electrodynamics. Muon-catalyzed fusion is a technical application of muonic atoms. A "hadronic atom" is an atom in which one or more of the
Olaf—An Atom Olaf—An Atom Olaf—An Atom is a 1913 American film directed by Anthony O'Sullivan and featuring Harry Carey. Broken by grief after his mother's death, Olaf becomes a wanderer. He is treated cruelly until he is given a meal by a woman at the homestead where she lives with her husband and baby. Olaf is able to return her kindness when he overhears a plot to rob the settlers of their home. He alerts the couple and delays the would-be thieves long enough for the husband to file a claim on his land. Olaf is injured by the claim jumpers but