Glass transition of two-component liquids. II. The Lamb-Mössbauer factors

The wave-number-dependent Lamb-Mössbauer factors (LMF’s) of big and small particles in a glass of neutral hard spheres are investigated within mode-coupling theory by varying size ratio δ, total packing fraction η, and concentration ${\mathit{c}}_1$. It is possible to form a glass by the big particles only, while the small particles retain their mobility. Diffusion blocking of small particles is achieved by increasing either η or δ. The wave-number dependence of the small particles’ LMF shows characteristic deviations from a Gaussian in contrast to big particles’ LMF, which is almost Gaussian.