Collision cell (IMAGE) DOE/Pacific Northwest National Laboratory Caption PNNL chemist Greg Eiden invented the collision cell, seen here, which allows scientists to more accurately tag and separate elements mixed together in samples. Credit (Photo by Andrea Starr | Pacific Northwest National Laboratory) 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.