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Adams, D.P.; Mayer, T.M.; Vasile, M.J.; Archuleta, K.
Applied surface science, 01/2006, Letnik: 252, Številka: 6Journal Article
We investigate evolving surface morphology during focused ion beam bombardment of C and determine its effects on sputter yield over a large range of ion dose (10 17–10 19 ions/cm 2) and incidence angles ( Θ = 0–80°). Carbon bombarded by 20 keV Ga + either retains a smooth sputtered surface or develops one of two rough surface morphologies (sinusoidal ripples or steps/terraces) depending on the angle of ion incidence. For conditions that lead to smooth sputter-eroded surfaces there is no change in yield with ion dose after erosion of the solid commences. However, for all conditions that lead to surface roughening we observe coarsening of morphology with increased ion dose and a concomitant decrease in yield. A decrease in yield occurs as surface ripples increase wavelength and, for large Θ, as step/terrace morphologies evolve. The yield also decreases with dose as rippled surfaces transition to have steps and terraces at Θ = 75°. Similar trends of decreasing yield are found for H 2O-assisted focused ion beam milling. The effects of changing surface morphology on yield are explained by the varying incidence angles exposed to the high-energy beam.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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