Stopping supersonic oxygen with a series of pulsed electromagnetic   coils: A molecular coilgun
  We report the stopping of a molecular oxygen beam, using a series of pulsed electromagnetic coils. A series of coils is fired in a timed sequence to bring the molecules to near-rest, where they are detected with a quadrupole mass spectrometer. Applications to cold chemistry are discussed. 
Edvardas Narevicius, Adam Libson, Christian G. Parthey, Isaac Chavez,   Julia Narevicius, Uzi Even, Mark G. Raizen