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← ScienceWhich risk increases when a pulsed laser-induced forward transfer is performed in vacuum?
A)Ablation plume arrives earlier✓
B)Material recrystallization becomes enhanced
C)Thermal damage to target increases
D)Laser wavelength undergoes a blueshift
💡 Explanation
Ablation plume expansion velocity greatly increases in a vacuum because there's practically no ambient gas to slow it. The mechanism is Knudsen diffusion; therefore the arrival of the ablated plume at the target is faster, generating lower-quality transfer, rather than other material changes in the process.
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