Illustration Scanning Tunneling Microscope (IMAGE) Kiel University Caption Each molecule can be separately addressed with a scanning tunneling microscope and switched between the states by applying a positive or negative voltage. Credit © Jan-Simon von Glasenapp and Rainer Herges 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.