Non-exponential tunneling in water near an electrode

A. Vaught, T. W. Jing, Stuart Lindsay

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


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 languageEnglish (US)
Pages (from-to)306-310
Number of pages5
JournalChemical Physics Letters
Issue number3
StatePublished - Apr 13 1995

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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