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Excimer
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{{Short description|Excited dimeric molecule containing a noble gas}} [[Image:Excimer energy diagram.svg|right|Excimer energy diagram]] An '''excimer''' (originally short for '''excited dimer''') is a short-lived polyatomic [[molecule]] formed from two species that do not form a stable molecule in the ground state. In this case, formation of molecules is possible only if such atom is in an [[electron]]ic [[excited state]].<ref>{{cite journal |doi=10.1088/0034-4885/38/8/001|bibcode=1975RPPh...38..903B|title=Excimers|year=1975|last1=Birks|first1=J. B.|journal=Reports on Progress in Physics|volume=38|issue=8|pages=903β974}}</ref> [[Heteronuclear molecule]]s and molecules that have more than two species are also called '''exciplex''' molecules (originally short for '''excited complex'''). Excimers are often diatomic and are composed of two atoms or molecules that would not bond if both were in the [[ground state]]. The lifetime of an excimer is very short, on the order of [[nanosecond]]s.
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