VIBRATIONAL LINE-SHAPES IN THE AMALGAMATED LIMIT - (PARA-D2)X(ORTHO-D2)1-X MIXED-CRYSTALS

The D2 vibrous have been studied by high-resolution Raman scattering i n mixed crystals of (p-D2)x(o-D2)1-x. The o-D2 and p-D2 vibrational tr ansitions are found to overlap. Line shapes calculated by the coherent potential approximation are in good qualitative agreement with the ex perimental data. The linewidth of the o-D2 transition is much larger t han the linewidth of the p-H-2 transition in (o-H-2)x(p-H-2)1-x mixed crystals with comparable J = 1 concentrations. Possible explanations f or this difference are discussed.