Efimov Trimer (IMAGE) Goethe University Frankfurt Caption This is efimov trimer in a gas beam of other particles. The three helium atoms form an acute triangle, their distance from the quantum cloud, shown in yellow, amounts to a hundredfold of the size of the atoms. Credit GU 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.