1. 
   excimer
   An excited dimer, 'non-bonding' in the ground state. For example, a complex formed by the interaction of an excited molecular entity with a ground state counterpart of this entity. IUPAC PHOTOCHEMICAL GLOSSARY (1992). See also exciplex.
   Found op http://www.chem.qmul.ac.uk/iupac/gtpoc/E.html
   
   
2. 
   Excimer
   An excimer (originally short for excited dimer) is a short-lived dimeric or heterodimeric molecule formed from two species, at least one of which is in an electronic excited state. Excimers are often diatomic and are composed of two atoms or molecules that would not bond if both were in the ground ...
   Found op http://en.wikipedia.org/wiki/Excimer
   
   
3. 
   excimer
   a combination of two atoms which survives only in an excited state and which dissolves as soon as the excitation has been lost
   Found op http://www.chemistry-dictionary.com/definition/excimer.php
   
   

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