Fig. 2 | Nature Communications

Fig. 2

From: Ultrafast charge transfer coupled with lattice phonons in two-dimensional covalent organic frameworks

Fig. 2

Two-dimensional transient absorption (TA) spectra. a Broadband TA spectra of COFs. b The upper panel shows the species-associated difference spectra (SADS) of COFs determined from the global kinetic analysis of TA spectra based on the sequential kinetics with the time constant of 124 fs and 1.25 ps. The amplitude of the first SADS was scaled for clear comparison with other SADS. The lower panel shows time-dependent population change of the SADS. The instrumental response function (dashed lines) is plotted together. c TA spectra of free-base porphyrin. d The upper panel shows the SADS of free-base porphyrin. The lower panel shows time-dependent population change of the SADS

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