The 1.875μ(σ+δ) and 1.379μ(σ+π) absorption bands of H₂O molecules in CCl₄ and CS₂ solutions and the 1.985μ(σ+π) band of D₂O in CCl₄ are presented. They are interpreted as indicating free rotation of water vapor-like molecules in solution. The dominant feature of each band is an enhanced Q-branch. We are unable to decide to what extent this enhancement is caused by a possible departure from the usual rotational distribution characteristic of vapors and to what extent by possible alterations in transition probabilities.
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Ellis et al. (1938) studied this question.
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