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An adjustable oxide-free tunnel junction for vibrational spectroscopy of molecules
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11.The results presented here do not depend upon the junction area, which has not yet been satisfactorily characterized. However, very crude estimates of this area, based on a comparison of the actual junction conductance with a semiclassical approximation to the conductance density [W. F. Brinkman, R. C. Dynes, and J. M. Rowell, J. Appl. Phys. 41, 1915 (1970)], yield an upper limit of 1000 nm2. This limit implies there are fewer than molecules, per adsorbed monolayer, within a typical junction.
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13.With this scaling, the intensity of a vibrational mode Δσ/σ is equal to the integrated peak area.
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