Thorium Ion Chain (IMAGE) Georgia Institute of Technology Caption Shown is a linear chain of 29 laser-cooled Th3+ atoms suspended in vacuum by an RF ion trap at the Georgia Institute of Technology. The atoms are near absolute zero temperature and repel each other via Coulomb repulsion because of their like charges. Credit Corey Campbell 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.