Fig. 2.

Transverse dynamic structure factors, $S_T\left(\overrightarrow{q},\omega \right)$, at the indicated values of the wave vector $\overrightarrow{q}$ in the (110) direction, calculated from Eq. 1. Three values of λ are shown, in a defective crystal state (A), at the amorphisation transition (B), and in the fully developed glassy phase (C). Two Brillouin peaks, corresponding to the T₁ and T₂ branches, are visible for λ = 0.84 and 0.81. In the glassy phase (λ = 0.7) only one degenerate excitation survives.