The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
The accurate mass (or exact mass) of an ion of specified isotopic composition is calculated by summation of the exact masses of the constituent atoms. Conversely, the empirical formula of an ion can be deduced from the measured accurate mass of the ion if the ion mass is low enough to limit the number of formulaic possibilities and if the exact mass value is known accurately enough.
The term "accurate mass" was found in the following pages: