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Cryogenic cations, electrons and anions are ubiquitous in space, participateon star formation chemistry and are relevant to studies on the origin ofmolecular biology homochirality. We report on a system to directly generate andtrap these species in the laboratory. Laser ablation of a solid target (LiH)facing a sublimating Ne matrix generates cryogenic electrons, anions, andcations. Axial energy distributions (of e$^-$, H$^\pm$, Li$^\pm$) peaked at0-25 meV are obtained in a Penning trap at 90 mT and 0.5 eV barrier. Anions canbe guided and turned neutral with low recoil energy by near-thresholdphotodetachment. An immediate prospect for this H$^-$ source is to loadhydrogen atoms into the ALPHA antihydrogen trap at CERN towards directspectroscopic comparison of both conjugated species beyond 13 significantfigures. The production is scalable and adaptable to different speciesincluding deuterium and tritium, relevant for neutrino mass and fusionresearch.

A platform for trapped cryogenic electrons, anions and cations for fundamental physics and chemical studies