Abstract
Abstract The optical excitation of a surface plasmon-polariton (SPP) at a gold/air interface has been used to monitor the thickness of an organic fluid layer condensed on the gold. By passing a current through the gold film its temperature (as monitored directly by its resistance) is elevated above that of the organic fluid reservoir. Measurement of the SPP resonance position as a function of the difference in temperature between the gold film and the fluid reservoir gives a direct determination of the equilibrium film thickness for a known thermal energy. From the degrees of freedom available to the molecules the variation of the bonding potential with distance from the gold surface is established. For methanol and monochlorobenzene the extra contribution to the free energy μAu-organic takes the forms of a power law in distance: μAu-methanol ∝thickness−0·53 and μAu-chlorobenzene ∝thickness−1·25.
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