Using molecular-dynamics simulation, the self-part of the generalized susceptibility χ″s(q, ω) is calculated for a binary soft-sphere system at various temperatures from the liquid state to the glassy state and at the wavelength equal to the mean inter-particle distance. The dynamical slowing is clearly seen in the imaginary part of χs(q, ω); the α-peak splits out from the single main peak in the liquid state and moves toward the lower frequency side, as the temperature is reduced to the supercooled liquid state. In the glassy state, another slow dynamics identified as the fast process appears between the two separate peaks.
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