INFRARED SPECTROSCOPY AND PHOTOCHEMISTRY ON SALT FIIMS
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Date
1988
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Ohio State University
Abstract
Sublimation as alkali metal halides in vacuo produces well-defined crystals of colloidal scale. Such films have high specific surface areas and are transparent from the infrared through the ultraviolet. Thus they are useful as substrates for the spectroscopic study of adsorbed $species^{1,2}$. We are currently exploring the photochemical behavior of small molecules adsorbed on sodium chloride. Sub-monolayer coverages of carbon monoxide, when irradiated with ultraviolet light, produce carbon dioxide and carbon monoxide cation; in the presence of sulfur, carbonyl sulfide is formed. We will discuss the role of the substrate in these reactions, and evaluate sodium chloride as a medium for modifying and trapping surface reactants. We will also make analogies between salt film and matrix isolation spectroscopy for the study in small molecule photochemistry.
Description
$^{1}$ g. Gevirzman, Y. Kozirovski, M. Folman, Trans, Faraday Soc., 65 (1969). $^{2}$ H.H. Richardson, C. Raumann, and G.E. Ewing, Sur, Sci, 185, 15 (1987).
Author Institution: Department of Chemistry, Indiana University
Author Institution: Department of Chemistry, Indiana University