INTENSITIES OF "INACTIVE" INFRARED BANDS IN LIQUID SOLUTIONS
Creators:Ferguson, E. E.
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Publisher:Ohio State University
“Molecular vibrations which are infrared inactive according to selection rules appropriate to the isolated molecule are commonly observed to absorb radiation in the liquid state as a consequence of molecular collisions. The intensities of such bands have been measured for several molecules in a variety of solvents. A system of “solvent ordering” according to the ability of a solvent to enhance (or diminish) the intensity of an inactive fundamental of a particular compound is found to exhibit considerable internal consistency, i.e., this ordering is maintained for other compounds. This spectroscopic solvent ordering can be related to such liquid properties as surface tension, solubility parameter, compressibility, etc. The best correlation found is with values of mean polarizability divided by molar volume, which is equivalent to a correlation between collision-induced absorption intensity and London dispersion forces.”
Author Institution: U. S. Naval Research Laboratory
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