Quantum interference distinguishes between constitutional isomers
  Matter waves, as introduced by de Broglie in 1923, are a fundamental quantum phenomenon, describing the delocalized center of mass motion of massive bodies and we show here their sensitivity to the molecular structure of constitutional isomers. 
Jens T\"uxen, Stefan Gerlich, Sandra Eibenberger, Markus Arndt, and   Marcel Mayor
quant-ph cond-mat.mtrl-sci