Kobori Triplets Visual summary (IMAGE) Kobe University Caption It was unclear what allows the energy of two low-energy photons to efficiently combine. Kobe University researchers now found that two molecules in an excited state have to be aligned, and for that to happen with a high likelihood, the excited states need to be able to move around between molecules of many different orientations. In addition, this hopping must not be too quick either, so there is enough time for the interconversion of different excited states. Credit OKAMAOTO Tsubasa Usage Restrictions Credit must be given to the creator. License CC BY 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.