Breaking a molecule’s mirror image

Physicists have demonstrated how a molecule’s symmetry can be broken.

Reinhard Dörner of Johann-Wolfgang-Goethe University in Frankfurt, Germany, and his colleagues began an experiment with a single, symmetrical molecule made of two hydrogen atoms. They then fired a single photon at the dumbbell-shaped molecule to split it. The photon’s energy caused one of the hydrogen molecule’s two electrons to peel away.