Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540..107n&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Physics
Space Environment, Materials
Scientific paper
The erosion of highly-ordered pyrolytic graphite (HOPG) upon exposure to hyperthermal atomic O(3P) atoms has been explored. Profilometry has been utilized in order to determine that the overall erosion yield is linear with respect to increasing atomic oxygen exposure at a constant sample temperature of 373 K. Atomic force microscopy (AFM) has been employed to image the eroded material that contains numerous nanoscale to microscale cylindrical etch pits. Since there is also a linear relationship between the etch pit diameter and atomic oxygen fluence, it is proposed that the largest cylinders are nucleated at or near the topmost sheet of the original graphite material. There is a large distribution of depths for cylinders of a chosen diameter. This suggests that the chemical and physical nature of the nucleation event plays a key role in the final depth of the etch pit.
Minton Timothy K.
Nicholson Kenneth T.
Sibener S. J.
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