Nano-Hillocks: Of Mountains and Craters (image) Helmholtz Association Caption Following bombardment with highly charged ions, nano-hillocks have formed in an area of localized melting. This is an atomic force microscope image. Credit Picture: HZDR Usage Restrictions None 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.