CCD Images of Be+ Ion Crystals (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. Credit MPIK Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.