Figure 10.

Comparison of the measured vibrational echo data (black) with the calculated vibrational echo data (red) for the N_δ–H tautomer of His64. Frequencies and values of T_w are the same as those shown in Figure 8. The vibrational echo signals were calculated using the FFCFs shown in Figure 6b. The parameters used in the vibrational echo calculation are listed in Table 2. The agreement is poorer for the N_δ–H tautomer of His64 than for the N_ε–H tautomer of His64 shown in Figure 8.