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Novel molecule makes its debut Physicists in Switzerland have observed a novel type of molecule known as an exciplex - short for excited complex - for the first time. Peter Moroshkin and colleagues at the University of Fribourg have seen evidence for an exciplex that contains one caesium atom and seven helium atoms, as well as a simpler version that contains just two helium atoms (D Nettels et al. 2005 Phys. Rev. Lett. 94 063001).
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