Abstract
Sodium atoms (108–1011 cm−3) effused from an oven where excited by two pulsed dye lasers (∼8–15 ns, ∼100 μJ) from the ground state 3s, via an intermediate state 3p, to a Rydberg state ns or nd (20≤n≤25). About 50 ns after the laser irradiation, a pulsed electric field (0.5–5.5 kV/cm) was applied to the Rydberg atoms to ionize them and accelerate the resulting ions. Thus, a pulsed ion beam was obtained with a maximum total electric charge of ∼5 pC, corresponding to a peak current of ∼25 μA with an output pulse of ∼200 ns full width at half-maximum.
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