Chemical species
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Chemical species is a common, name for atoms, molecules, molecular fragments and ions as entities being subjected to a chemical process or to a measurement. Generally, a chemical species can be defined as an ensemble of chemically identical molecular entities that can explore the same set of molecular energy levels on a characteristic or delineated time scale. The term may be applied equally to a set of chemically identical atomic or molecular structural units in a solid array.1
In supramolecular chemistry, chemical species are those supramolecular structures whose interactions and associations are brought about via intermolecular bonding and debonding actions, and function to form the basis of this branch of chemistry.
References
1. IUPAC Compendium of Chemical Terminology 2nd Edition (1997).See also: List of particles
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