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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...