Arun Devaraj atomic probe sampling (IMAGE) DOE/Pacific Northwest National Laboratory Caption Materials scientist Arun Devaraj works at an atom probe tomography instrument at Pacific Northwest National Laboratory. This precision instrument can show the placement of atoms in tiny samples of materials, such as metal alloys. Credit (Photo by Andrea Starr | 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.