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← ScienceWhich outcome reduces plasma etching rates despite fixed energy input?
A)Increased collisional deactivation of radicals✓
B)Elevated substrate temperature gradients
C)Decreased volatile byproduct formation
D)Enhanced ion bombardment substrate density
💡 Explanation
Increased pressure raises collision frequency, which enhances collisional deactivation of radicals, so reduces etching rates, because radicals are consumed before reacting with the substrate. Therefore, rates decline due to limited radical availability rather than increased energetic species reaching surface.
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