An ion formed by the combination of more ions or atoms or molecules of a chemical species often in
association with a second species. For example,
[(H2O)nH]+
is a
cluster ion.
Source:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1549