An excimer (originally short for excited dimer) is a short-lived dimeric or heterodimeric molecule formed from two species, at least one of which has completely filled valence shell by electrons (for example, noble gases). In this case, formation of molecule is possible only if such atom is in an electronic excited state. Heteronuclear molecules a...
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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.
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a combination of two atoms which survives only in an excited state and which dissolves as soon as the excitation has been lost
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http://www.chemistry-dictionary.com/definition/excimer.php
a molecular complex of two, usually identical, molecules that is stable only when one of them is in an excited state.
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