Sympathetic cooling of 4He+ ions in a radiofrequency trap
Abstract
We have generated Coulomb crystals of ultracold 4He+ ions in a linear radiofrequency trap, by sympathetic cooling via laser--cooled 9Be+. Stable crystals containing up to 150 localized He+ ions at 20 mK were obtained. Ensembles or single ultracold He+ ions open up interesting perspectives for performing precision tests of QED and measurements of nuclear radii. The present work also indicates the feasibility of cooling and crystallizing highly charged atomic ions using 9Be+ as coolant.
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