We present a novel approach to the preparation of neutral (anti-)matter. The scheme is based on recombination of a free electron and an ion, and can be considered as the inverse of pulsed field ionization. We have obtained promising results on rubidium: at low densities already efficiencies of 0.3% were obtained. This is orders of magnitude more than has been achieved in previous recombination studies.

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Journal Phys. Rev. Lett.
Wesdorp, C, Robicheaux, F, & Noordam, L. D. (2000). Field-induced electron-ion recombination: A novel route towards neutral (anti-)matter. Phys.Rev.Lett., 84, 3799–3802.