Question

what are isobaric species

Answer 1

Isobaric species are the special with same mass no. But diff. Atomic no.

Answer 2

Two (or more) ions are isobaric if they have the same nominal mass but different exact mass. For example positive radical ions of N2, CO, and C2H4 all have nominal mass of 28 units (z = 1). However, their exact (monoisotopic) masses are 28.00559, 27.99436, and 28.03075 units respectively.