Sputter Erosion of Pd (111) and Pt(111)
Abstract
During the sputter-erosion of Pd (111) by 1 keV Ar^+ ions in the temperature range ∼ 780-1000K we observe the development of ridges that deepen as sputtering continues up to ∼ 200 ML removed. Step edges observed by low energy electron microscopy (LEEM) appear as contour lines that define the detailed topography of the rippled surfaces. Different characteristic step profiles, and hence surface geometries are observed after short and long sputtering times. The sequence, starting with sine-like waves, and evolving to sharp-topped ripples, resembles the interfacial structures reported for the Mullins-Sekerka instability of driven solidification interfaces. At long sputtering times the ridges adopt crystallographic orientations, as reported in recent studies of the ion erosion of crystal surfaces. A study of Pt(111), which shows similar behavior in a narrower temperature range, will also be discussed.
Supported in part by the DOE under grants DEFG02-02ER46011 and DEFG02-91-ER45439.- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARW33003O