The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
Penning ionization (PI)
Penning ionization (PI) is caused by interactions between excited neutral atoms or molecules (A. or M.) and sample molecules. The internal energy of the excited neutral particles must exceed the ionization energy of the sample molecules and the lifespan of the excited state must be longer than the interac-tion time. M+ A- --> M+. + A + e-