FIGURE 4.

Transient absorption changes of c-AMPB for the cis → trans (top) and the trans → cis (bottom) reaction for different delay times and probing wavelengths. The white-light probe pulses covered a spectral range from 350 nm to 650 nm; the thick lines along selected delay times (200 fs, 2 ps, 20 ps, and 1 ns) represent the individual transient spectra depicted in Fig. 5, e and f.