FIGURE 3.

Transient IR difference spectra of PR at pD 6.4 and pD 9.2 in the regions 1590 cm⁻¹–1680 cm⁻¹ (C=N stretching) and 1500 cm⁻¹–1580 cm⁻¹ (C=C stretching) at selected delay times. Differences in the amplitudes at the different pD values originate mainly from differences in the protein concentration.