Abstract
Abstract Inelastic electron tunnelling spectra of 1- and 2-naphthylacetic acid, 1- and 2-naphthoic acid, 1- and 2-naphthylacetate and 1-naphthylacetamide were measured at 4.2 K in the range 100–4000 cm−1. The molecules were transferred onto the alumina surface by the vacuum deposition method. The spectra showed intensive and sharp peaks originating from aromatic rings. However, the spectra from naphthylacetates were of poorer quality than those from the other compounds and hence their adsorption orientation was concluded to be more parallel with respect to the surface of alumina. The adsorption of the naphthylacetates was possibly followed by dissociation of the molecules. The I, U characteristics were also measured, and it was observed that the naphthoic acids yielded the most nonlinear curves.
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