Abstract
The extinction coefficient of the singlet-triplet transition of alpha-chloronaphthalene in ethyl iodide is found to increase almost linearly with the density of the compressed mixture. Study of a 1 : 2 volume ratio of these components over a pressure range from 1 to 3644 atmospheres resulted in about a two fold increase in light absorption, with little other changes in band envelope. No increase in absorption coefficient was obtained for pure liquid alpha-chloronaphthalene subjected to comparable increase in hydrostatic pressure. The increase in extinction coefficient is attributed to the increase in collisional frequency resulting from the increase in concentration of the constituents and the corresponding decrease in the liquid ``cage'' dimensions with increased density.
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