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Gated ICCD images of the integrated emission from the expanding plasma plume for different time delays with respect to the plasma initiation. The integration time was fixed as 4 ns. The ambient gas pressure was varied from to 3 Torr.
Plume length vs time plots for the observed images for three different ambient environments (a) vacuum, (b) , and (c) 3 Torr of argon gas. The solid line represents the best fit of the experimental data in accordance with the linear fit, drag model, and shock wave model for the ambient pressures , , and 3 Torr, respectively.
Aspect ratios (length/width) of the plume as a function of time delay and ambient gas pressure.
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