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Calculate the wavelength for an STM tip with a 4.5 eV work function across a
vacuum gap. 11 the tip is initially positioned 2 Å from a surface and is moved 1 Å further away,
does the tunneling current increase or decrease and proportionally by how much? QM Hint:
h2k2/2m-E-V and k = 2π/λ.

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