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← ScienceWhich consequence results when an STM tip is positioned too far from a sample surface, impacting tunneling current stability?
A)Increased feedback loop oscillations develop
B) tip apex bluntness decreases precision
C)Current resolution drops to noise floor✓
D)Piezoelectric scanner saturation prevents imaging
💡 Explanation
Poorly positioned STM tips struggle with quantum tunneling of electrons; extremely small air gaps are needed for detectable current. Therefore, the current resolution significantly drops because the probability of tunneling substantially decreases, rather than oscillating or other effects.
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