Electron Beam Ionization Simulation (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption An electron beam passes through a mixture of hydrogen and xenon gases that it ionizes, transforming the mixture into a plasma of protons, xenon ions, and electrons. Cold plasma electrons appear as green dots and ionized xenon ions appear as red dots in this image. Credit Jean-Luc Vay and Rémi Lehe 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.