ON THE USE OF INFRARED PSEUDO MATRIX ISOLATION SPECTROSCOPY FOR PHOTOCHEMICAL STUDIES IN THE SOLID STATE

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1968

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Ohio State University

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Pseudo matrix isolation (PMI) is a method of low temperature $(20^{\circ}K)$ sample preparation which has evolved recently from work in connection with problems in gas mixture analysis. It is a variation on conventional matrix isolation and is attractive because it provides a rapid (and reproducible) method of sample preparation. It is characterized principally by discrete pulse deposition of gaseous materials onto a cooled substrate in contrast to the slow continuous condensation of gas typical of the conventional matrix method. Because it is imperative that solids to be used for detailed low temperature photochemical studies be well defined, we have been investigating the nature of the PMI solid. The photochemical dissociation of HI and subsequent chemical reactions of primary products with scavengers or reactants such as ethylene and carbon monoxide have been used as probes to elucidate some details of the PMI solid state. It appears possible to control the composition of PMI samples in a microscopic way so as to juxtapose in a low temperature solid reactants of interest. Diffusion in such solids has been explored and is pertinent to the chemistry one obtains subsequent to photolysis. Matrices of various materials have been used and a number of these will be discussed. The use of energy transfer in the solid state to achieve delicate photochemistry is being explored and will be mentioned. Also attempts to prepare the XeF radical in a medium suitable for infrared study will be reviewed.

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Author Institution: Bell Telephone Laboratories, Murray Hill

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