Abstract
We have studied the optical emission of plasma expanding from a target made of a binary alloy or a pressed powder mixture and ablated by nanosecond laser pulses of moderate power. The intensity of spectral lines has been studied for the first time as dependent on the target composition. It is established that a three-dimensional percolation takes place in the plasma, with a percolation threshold determined by the atomic density of a metal component in the target composition.
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