Laserpulse (IMAGE) Vienna University of Technology Caption A laser pulse hits a helium atom. One of the electron is ripped out of the atom, the other electron may change its quantum state. Credit TU Wien 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.