(IMAGE)

Physikalisch-Technische Bundesanstalt (PTB)

Caption

Figure 2: These are CCD images of Be+ ion crystals in the CryPTEx Paul trap. The positions of (dark) Ar13+ ions are marked by red crosses: Crystal of about 1,500 Be+ ions (a) before and (b) after implantation of five Ar13+ ions. (c) A single Ar13+ ion is surrounded and cooled by 29 crystallized Be+ ions. (d) One Ar13+ ion sympathetically cooled by one laser-cooled Be+ ion.

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MPIK

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