Abstract
The adsorption and reaction of acetic acid have been studied using the technique of reflection-absorption infrared spectroscopy. Evaporated copper films on both glass and gold substrates have been oxidized to cuprous oxide and allowed to interact with gaseous acetic acid. The results indicate that at ambient temperatures acetic acid adsorbs on cuprous oxide to form a vacuum stable (10 −7 Torr), thick (several hundred angstrom) film having an ionic lattice comprised primarily of discrete protons and acetate ions. At higher temperatures (near 200°C) incorporation of copper ions into the film occurs with apparent partial decomposition of the acetate ion. The general implications of these results on the understanding of the mechanisms of attack of organic acids on metal-metal oxide surfaces is discussed.
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