Abstract
Earlier Raman studies confirming the molecular dissolution of protium and Geuterium in silica have been extended to include room-temperature measurements of the vibra ional-rotational Raman bands and the temperature dependence (11-800 K) of the $Q$ bands. Observation of the $S$ bands provides evidence for ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$ molecular rotation in vitreous silica. The temperature and isotope dependence of the $Q$-band frequency shifts are found to agree with predictions of a solubility model based on a single molecule in a small confining interstice. The origin and temperature dependence of the $Q$-band line shape are discussed within the context of various models which include inhomogeneous broadening, collisional broadening, and recent theories of motional narrowing.
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