Potential energy threshold for nano-hillock formation by impact of slow highly charged ions on a CaF2(111) surface
A. S. El-Said, W. Meissl, M. C. Simon, J. R. Crespo López-Urrutia, C. Lemell, J. Burgdörfer, I. C. Gebeshuber, HP. Winter, J. Ullrich, C. Trautmann, M. Toulemonde, F. Aumayr
Abstract
We investigate the formation of nano-sized hillocks on the (111) surface of CaF2 single crystals by impact of slow highly charged ions. Atomic force microscopy reveals a surprisingly sharp and well-defined threshold of potential energy carried into the collision of about 14 keV for hillock formation. Estimates of the energy density deposited suggest that the threshold is linked to a solid-liquid phase transition (``melting'') on the nanoscale. With increasing potential energy, both the basal diameter and the height of the hillocks increase. The present results reveal a remarkable similarity between the present predominantly potential-energy driven process and track formation by the thermal spike of swift ( GeV) heavy ions.
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