To modify a metal surface at the scale of atoms and
molecules—for instance to refine the wiring in computer chips or the reflective
silver in optical components—manufacturers shower it with ions. While the
process may seem high-tech and precise, the technique has been limited by the
lack of understanding of the underlying physics. In a new study, Brown University
engineers modeled noble gas ion bombardments with unprecedented richness,
providing long-sought insights into how it works.
"Surface patterns and stresses caused by ion beam
bombardments have been extensively studied experimentally but could not be
predicted accurately so far," said Kyung-Suk Kim, professor of engineering at
Brown and coauthor of the study published in the
Proceedings of the Royal Society A. "The new
discovery is expected to provide predictive design capability for controlling
the surface patterns and stresses in nanotechnology products."
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