Angle-Resolved Photoemission Spectroscopy (IMAGE) Tohoku University Caption Electrons are emitted from the surface by shinning ultraviolet light. The electronic structure of crystal is determined by measuring the energy and the emission angle of electrons. Credit Takashi Takahashi 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.