Vibrational-Rotational Radiation Transitions in Water Molecules In Nonpolar Solvents

The $1.875\mu (\sigma +\delta )$ and $1.379\mu (\sigma +\pi )$ absorption bands of ${\mathrm{H}}_2$O molecules in C${\mathrm{Cl}}_4$ and C${\mathrm{S}}_2$ solutions and the $1.985\mu (\sigma +\pi )$ band of ${\mathrm{D}}_2$O in C${\mathrm{Cl}}_4$ 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.