Sympathetic cooling of $^4$He$^+$ ions in a radiofrequency trap

Details Sympathetic cooling of $^4$He$^+$ ions in a radiofrequency trap Sympathetic cooling of $^4$He$^+$ ions in a radiofrequency trap

2004-12-09

arxiv.org/abs/physics/0412053v1

Physics

Atomic Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.94.053001

We have generated Coulomb crystals of ultracold $^4$He$^+$ ions in a linear radiofrequency trap, by sympathetic cooling via laser--cooled $^9$Be$^+$. Stable crystals containing up to 150 localized He$^+$ ions at $\sim$20 mK were obtained. Ensembles or single ultracold He$^+$ 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 $^9$Be$^+$ as coolant.

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