The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
Isobaric ions have identical masses (at whatever level of accuracy chosen) but have differen atomic compositions. A common example is a positive ion at m/z 28 which can have the empirical formulas of CO+, N2+ , or C2H4+.