Fig. 5.

The buildup of C7 (^βCH₂) to C8 (^αCH) (open symbols) and C8 to C7 (filled symbols) cross-peak intensity as a function of t_mix for (a,c) U-¹³C and (b,d) U-¹³C^dil_10% L-Tyrosine·HCl. In (a) and (b), the cross-peak intensities are normalized with respect to the intensity of the corresponding diagonal peak for zero mixing time, i.e., $I_{LM}^{ex}(t_{\mathit{mix}})/I_{LL}^{ex}(0)$. In the case of the U-¹³C^dil_10% sample, a scaling by the factor λ as defined in Eq. (27) of 0.91 was applied to $I_{LL}^{ex}(0)$. (c) and (d): corrected normalized buildup plots given by $F_{LM}^n(t_{\mathit{mix}})$ as defined in Eqs. (19) & (28) of Section 3.2. Tables 1 and 2 list the η_L and ε_LM coefficients.