APCRS spectra at step (IMAGE) National Institutes of Natural Sciences Caption Figure 2 Atomic point contact Raman spectra obtained at an atomic step and a flat surface of the Si(111)-7×7 surface. Credit NINS/IMS Usage Restrictions None License Licensed 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.