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

Abstract

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.

4 pages, 2 figures

References in corpus (5)

• Sympathetic cooling of ${}^{9}B{e}^{+}$ and ${}^{24}M{g}^{+}$ for quantum logic
• Sympathetic Cooling of Trapped Cd+ Isotopes
• Molecular Dynamics Simulation of Sympathetic Crystallization of Molecular Ions
• Instability Heating of Sympathetically-Cooled Ions in a Linear Paul Trap
• The 2S-2P Lamb Shift in He+

Cited by in corpus (14)

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• Vibrational spectroscopy of H2+: precise evaluation of the Zeeman effect
• Ellipsoidal Coulomb Crystals in a Linear Radiofrequency Trap
• Precision measurements with cold atoms and trapped ions
• Limits to differences in active and passive charges
• A self-injection locked DBR laser for laser cooling of beryllium ions
• A scheme for quantum-logic based transfer of accuracy in polarizability measurement for trapped ions using a moving optical lattice
• Motional resonances of three-dimensional dual-species Coulomb crystals
• Deterministic preparation of a dual-species two-ion crystal
• Sympathetically cooled molecular ions: from principles to first applications