isotopic molecular ion
A molecular ion containing one or more of the less abundant naturally occurring @I03331@ of the atoms that make up the molecular structure. Thus, for ethyl bromide there exist isotopic molecular ions such as: 13CCH5Br+·, C2H4DBr+·, C2H581Br+·, 13C2H581Br+·, etc.
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 [Terms] [Paper]