Figure 2 (IMAGE) Nagoya University Caption Direct observation of valence electron density was done by synchrotron radiation X-ray diffraction at SPring-8. Theoretical results using a quantum mechanical modelling method called density functional theory (DFT) matched with the observation. Credit Sawa lab, Nagoya University / photo provided by RIKEN Usage Restrictions Credit must be given where image is used 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.