excimer

excimer

[ek-suh-mer]
noun Chemistry.
a molecular complex of two, usually identical, molecules that is stable only when one of them is in an excited state.

Origin:
1960–65; exci(ted) + (di)mer

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excimer (ˈɛkˌsaɪmə)
 
n
physics an excited dimer formed by the association of excited and unexcited molecules, which would remain dissociated in the ground state

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