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Which outcome arises when a STM tip's electric field increases on a gold surface?

A)Increased electron quantum tunneling current
B)Suppressed thermionic electron emission
C)Decreased surface plasmon resonance energy
D)Enhanced diffusion barrier for adatoms

💡 Explanation

An increased electric field enhances **quantum tunneling** of electron wave functions, because the barrier width decreases exponentially, therefore increasing tunneling probability and measured current, rather than thermionic emission at higher temperatures.

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