Abstract
We have measured the inverse decay length (κ) for tunneling in water between a Pt-Ir tip and an Au(111) surface. At 109 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 108 Ω. The tunnel gap at 109 Ω is about 20 Å, 12 Å more than predicted by ab initio calculations. It is Ohmic for resistances between 109 and 106 Ω and voltages less than 0.1 V, implying that sharp resonances do not play a role.
Original language | English (US) |
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Pages (from-to) | 306-310 |
Number of pages | 5 |
Journal | Chemical Physics Letters |
Volume | 236 |
Issue number | 3 |
DOIs | |
State | Published - Apr 13 1995 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry