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A study has been made of the absorption of aqueous solutions of some halogen salts in the region of 4.7μ. It has been found that KF shifts the bands to shorter wave-lengths, while KCl, KBr, and KI shift the band to longer wave-lengths. The effect is explained as due to changes in hindered rotation as produced by the binding forces between the ions and water molecules. The changes in position of the band vary with concentration. The kind of positive ion does not seem to change the effect when the same negative ion is in solution.
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Plyler et al. (1938) studied this question.
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