Excitons moving inside TaSe3 (IMAGE) City University of Hong Kong Caption During angle-resolved photoemission spectroscopy (ARPES), an electron is ejected into a vacuum and an exciton is formed when the hole left by the electron pairs up with an electron at the Fermi level. The researchers gained insight into the excitons forming and moving inside the TaSe3 sample by measuring the energy of the electrons emitted into the vacuum. Credit City University of Hong Kong Usage Restrictions Image must be used with appropriate caption and credit. License Original 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.