Fig. 4: Principal components analysis of BChla 2DES. | Nature Communications

Fig. 4: Principal components analysis of BChla 2DES.

From: Two-dimensional electronic spectroscopy of bacteriochlorophyll a with synchronized dual mode-locked lasers

Fig. 4

a The 2D optical frequency spectra of two major principal components of the 2D coherent vibrational spectra for rephasing interaction pathway. b The vibrational spectra of a multiplied by their score. Relatively intense six peaks at 190, 337, 564, 728, 901, and 1156 cm–1 are marked with their centre frequencies. c Coherent vibrational spectra obtained by Fourier-transforming the Tw-dependent 2DES signals at (390 THz, 390 THz) and (390 THz, 375 THz). The amplitudes of the three vibrational modes at 337, 564, and 901 cm−1 are significantly small in the CVS from the 2DES signal close to the SE0 position. d Theoretically calculated coherent vibrational spectra of BChla with respect to Qy excitation, where λ indicates vibrational reorganization energy. The numbers in square brackets are the indices of the vibrational modes. See Supplementary Note 6 for more details on the simulation schemes 1 and 2.

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