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Ablationof A Nanostructured Metal Surface By Ultrashort X-ray Pulses

Ablationof A Nanostructured Metal Surface By Ultrashort X-ray Pulses
Yudi Rosandi, Herbert M.Urbassek
Universitas Padjadjaran, Applied Surface Science 307(2014)142–145, http://dx.doi.org/10.1016/j.apsusc.2014.03.193, journalhomepage:www.elsevier.com/locate/apsusc
Bahasa Inggris
Universitas Padjadjaran, Applied Surface Science 307(2014)142–145, http://dx.doi.org/10.1016/j.apsusc.2014.03.193, journalhomepage:www.elsevier.com/locate/apsusc
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Using molecular-dynamics simulation, we study the interaction of an ultrashort X-ray pulse with an Al surface. The surface has a periodic grating structure consisting of alternating ridges of height 80 nm and width 80 nm, separated by trenches of width 160 nm. After irradiation with an ultrashort (0.2 ps) X-ray pulse with a ?uence above the ablation threshold we observe that the ridges ?rst disintegrate into a foamy mixture of melt and gas bubbles, which grow faster than those in the trenches. Due to the interference of tensile pressure build-up below the ridges and the trenches, the material does not spall. At the concave edges, jets are emitted with velocities of around 1000 m/s, which may ultimately lead to the creation of ?ner surface structures.

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