X-ray/Optical Wave Mixing in Diamond (image) DOE/Lawrence Berkeley National Laboratory Caption Simulated valence-charge density from x-ray and optical wave-mixing shows the nuclei of carbon atoms as dark spots revealed by diffracted x-rays and the peaks of some of the bonds between them as white and blue spots induced by the polarized optical pulse. In diamond, the optical pulse primarily wiggles the charge that makes up chemical bonds. Credit Thornton Glover et al. Usage Restrictions Credit required 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.