Abstract
The majority of tunneling studies to date have focused on the adsorption of organic alcohols, acids, and amines on alumina and, less frequently, magnesia. This preoccupation with reactive organics is probably due to (a) the existence of a large body of ir, ESR, and chemical information concerning the adsorption of these materials on bulk oxides; (b) the desire of the experimenter to control the cleanliness of the surface by using vapor phase adsorption within the confines of the vacuum system whenever possible; (c) the high C-C and C-H bond energies of most of the systems studied preclude “backbone” reactions of the adsorbates and limit chemical modifications on adsorption to changes associated with the reactive group (OH, CO2H, NH2). This last factor, coupled with the rather large heats of formation of metal-oxygen and metal-amine bonds, limits the breadth of chemical and physical changes which can occur in adsorption and with deposition of the top metal electrode. For example, one does not usually observe a large (≥1%) change in C-C or C-H motions of adsorbed organics once the image-dipole correction has been made. The chemical specificity of reaction evidenced by these organic systems tends, therefore, to provide a somewhat simplistic picture of the processes which occur in the production of doped tunnel junction.
Tunneling studies were supported by the National Science Foundation under Grant DMR-7820251 and DMR-8115978.
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© 1982 Plenum Press, New York
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Hipps, K.W., Mazur, U. (1982). The Study of Inorganic Ions. In: Hansma, P.K. (eds) Tunneling Spectroscopy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1152-2_8
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