Diffraction Patterns - Argonne (IMAGE) DOE/Argonne National Laboratory Caption Diffraction patterns captured before and after a 20-nanosecond electrical pulse. The star-shaped pattern of small white spots, left, corresponds to the initial charge density wave pattern, which is temporarily melted by the heat from electrical pulse, right. Credit (Image by Argonne National Laboratory.) Usage Restrictions Original content 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.