The technique of static beam deflection in beam foil spectroscopy is discussed. This technique allows the determination of the parent ionization stage of the emitting ions. A comparison between electric and magnetic field deflection is made. Electric deflection experiments carried out to date are reviewed.
Uwe Fink, "Charge Deflection Experiments in Beam Foil Spectroscopy," Appl. Opt. 7, 2373-2375 (1968)