What are isobaric ions?
Isobaric ions are simply ions that have the same nominal mass but different exact mass. For example N2, C2H4 and CO all have a nominal mass of 28 Da. Their exact masses are: N2 = 28.00615 Da, C2H4 = 28.0313 Da and CO = 27.99491. A resolution of about 2500 is required to fully resolve these three ions.