A Superfast Molecular Motor (IMAGE) University of Groningen Caption Upon simultaneous excitation of the two chromophores by light the they repel each other through dipolar interactions. As the chromophores are bound to each other they start rotating about the bond keeping them together. Credit Thomas Jansen, University of Groningen Usage Restrictions With credit 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.