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Beams of Li + ions accelerated to kinetic energies in the range 10-475 kev were brought into charge equilibrium in the gases H 2 , He, and N2 and the fractional amounts of Li~, Li°, Li + , Li ++ , Li +++ measured. Because of the relatively large amount of Li~ in an equilibrated beam below 40 kev in energy in propane and nitrous oxide, limited investigations were carried out in these gases. The anomalously large Li ++ yield in helium at Li 7 energies below 100 kev was noted.By holding each separated charged constituent successively in an orbit in a magnetic field, admitting gas, and observing the beam attenuation, the total cross section for all charge-changing collisions was observed. Through application of the differential equations for growth or decay of a charged component, certain individual charge-changing cross sections can be deduced from these observed sums. Values are given for (070-fori),

The preparation of artificial β-eucryptite (Li2O Al2O3 2SiO2) as a filament coating for the emission of Li+ ions is discussed. Two ion sources with their initial focusing gaps are described.