Figure 8: Arrhenius plots of the diffusion coefficients in the range 40–300 K. Solid line: the QI results for the quantized lattice; dotted line: the QI results for the rigid lattice; dashed line: the CVT/SCSAG results for the rigid lattice [55]. Pluses, circles, squares, and crosses are experimental results of Lee et al. [58], George et al. [56], Mullins et al. [57], and Lin and Gomer [59], respectively.