Abstract
The adsorption of CO and C6H12 on thin (≈50A) silver films has been studied using Transmission Fourier Transform Infrared Spectroscopy. Recent results have shown that for films deposited at TD150 K ‘active’ sites are available for CO chemisorption whereas at higher deposition temperatures CO will not chemisorb. In the present study CO adsorption on a Ag film (TD = 130 K) leads to two absorption bands in the infrared: an initial broad band at 2087 cm−1 followed by a sharper band at 2137 cm−1 which grows in with no shift in frequency with increasing pressure. A correlation is made between this result and the results of previous studies on matrix-isolated Ag clusters. The IR spectra of C6H12 adsorbed on a Ag film deposited at TD = 130 K presented here show that the C6H12 is chemisorbed with a ‘softened’ CH stretching vibration indicating hydrogen-bonding with the metal. However, on a film annealed to room temperature only physisorbed C6H12 is observed.
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