Figure 5:

Experimental measurement of final magnetization after a sweep through resonance. Top: Solution ${ }^1\text{H}$ NMR of 200k polystyrene in ${\text{CDCl}}_3$ at $-{60}^{\circ }\text{C}$ and 500 MHz. The integrated NMR peaks used in the analysis are numbered and shaded in purple. Bottom: Final magnetization after a chirped pulse plotted $vs$. the ${\alpha }_1$ sweep-rate parameter for the four numbered resonances (sweep rate $=800\text{kHz}{\text{s}}^{-1}$, sweep time $2t_0=100\text{ms}$). Colored squares are experimental data, black circles are numerical simulations, and black lines are eq. 63.