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. 2022 Jun 9;13(24):5413–5423. doi: 10.1021/acs.jpclett.1c04162

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© 2022 The Authors. Published by American Chemical Society

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Results for rhodamine 101. (a) Molecular structure. (b) Measured transient-absorption spectra, with population decays subtracted from the 1 ps data set view. Absorption and fluorescence spectra displayed in violet and green, respectively, along with the laser pulse spectrum in cyan. (c) 1D vibronic spectrum. Vertical blue lines indicate peaks to be analyzed with FCS. (d) Measured (black) and fitted harmonic (red) and anharmonic (dark cyan) FCS amplitude profiles at indicated oscillation frequencies. (e) Measured (black) and unequal-curvature harmonic (orange) FCS amplitude profiles at indicated frequencies. Dashed lines in panels b, d, and e indicate absorption and fluorescence maxima.