The q l distributions for bulk β-Li 3 PS 4 and 75Li 2 S-25P 2 S 5 glass obtained with l = 1 to l = 4 for τ = 100 ps are shown in Fig. . The distribution derived from bulk 75Li 2 S-25P 2 S 5 glass is broader than that of bulk β-Li 3 PS 4 . Clear overlap occurs in the distributions derived from q 1 and q 2 , making perfect identification of crystalline and glassy PS 4 3units impossible.