Abstract
We have measured the inverse decay length (κ) for tunneling in water between a Pt-Ir tip and an Au(111) surface. At 10 9 Ω κ = 0.92 ± 0.16 Å −1 (Au negative), almost independent of electrochemical potential. An unexpected drop is observed as the gap resistance is reduced below 10 8 Ω. The tunnel gap at 10 9 Ω is about 20 Å, 12 Å more than predicted by ab initio calculations. It is Ohmic for resistances between 10 9 and 10 6 Ω and voltages less than 0.1 V, implying that sharp resonances do not play a role.
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