Abstract
The gas-dynamic effects which are so prominent in laser-pulse sputtering have three limiting cases. The one limit could be described as an unsteady adiabatic expansion (UAE) due to gas which escapes from a finite reservoir (“outflow” model). The second limit is that the particles are released from target surface, form a Knudsen layer (KI,), and then enter a UAE (“KL-UAE” model). Closely related is the third limiting case, which allows for condensation at the surface (“condensation” model). Explicit photographs suggest that either the KI: UAE or the condensation model is relevant to laser-pulse sputtering of the polymer polymethylmcthacrylate (PMMA).KeywordsSound SpeedTarget SurfaceDistance RatioKnudsen LayerCondensation ModelThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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