Figure 10.

(A) Oscillatory component of the TR-ISRS signal of PYP at ΔT = 60 ps, obtained after subtracting the slowly changing population component. (B) Time-resolved Raman spectrum at ΔT = 60 ps, obtained as the Fourier transform power spectrum of the oscillatory component shown in panel A. Weak bands are shown with a magnified scale (×50). (C) Calculated Raman spectra of the two model systems based on the pR₀ and I_T structures (PDB ID: 4B9O and 4I38) in the fingerprint region, shown with 8 cm^–1 bandwidth. The experimental I₀ spectrum is also shown for comparison. (D) Optimized structure of the model PYP based on pR₀. Nuclear motion associated with the calculated 628 cm^–1 mode is also shown with arrows. Panels A–D adapted with permission from ref (67). Copyright 2017 Nature Publishing Group.