Experiment (IMAGE) National Institutes of Natural Sciences Caption Figure 1 (a) Illustration of the experiment. (b) Scanning electron micrograph of a Ag tip (top) and scanning tunneling microscopy image of the Si(111)-7×7 surface. (c) Atomic point contact Raman spectra. 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.