Attosecond physics water spray sample (IMAGE) DOE/Pacific Northwest National Laboratory Caption Water sample photo: To record the movement of electrons excited by X-ray radiation, scientists create a thin, approximately 1 centimeter-wide, sheet of liquid water as a target for the X-ray beam. Credit Emily Nienhuis | Pacific Northwest National Laboratory Usage Restrictions No restrictions. License Public Domain 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.