Abstract
Gallium atoms (10 8−10 11 cm −3) effused from an oven were excited stepwise from their 4p ground state to a Rydberg state np (20 ≤ n ≤ 52) by two pulsed dye lasers ( ∼ 2–10 ns, ∼ 10–100 μJ). About 50 ns after the laser irradiation, a pulsed electric field (0 kV/cm) was applied to the Rydberg atoms to ionize and accelerate the resulting ions. Thus, a pulsed gallium ion beam of purity >99.99% was obtained with a maximum total electric charge of ∼ 2 pC and a pulse width of ∼ 200 ns full width at half maximum.
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