Fig. 3. DAS beatmaps of BChla (left) and LH2 (right). The BChla assignments are aided by only having one electronic state within the bandwidth of the laser and simpler dynamic processes. The BChla 13 fs component indicates a global shift energy and is attributed to a Stokes shift convolved with instrument response. The 76 fs component appears to be an internal relaxation process with signal growth at the low energy side of the spectra (highlighted in the circle). The 74 fs LH2 component most likely has similar internal relaxation processes, but also appears to have amplitude at the downhill cross-peak [ωτ, ωτ] = [–12 400, 11 700] cm–1, located in the hexagon, at roughly the electronic coherence energy. Grey bands are located on the energies of the B800 and B850 states.
