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Updated: Aug 24, 2025

Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
Published on: August 9, 2019
Comparative Absorption Dynamics of the Singlet Excited States of Chlorophylls a and d
Dmitry A Cherepanov1,2, Anastasia A Petrova2, Mahir D Mamedov2
1N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, 119991, Russia. tscherepanov@gmail.com.
Abstract:
Transient absorption dynamics of chlorophylls a and d dissolved in tetrahydrofuran was measured by the broadband femtosecond laser pump-probe spectroscopy in a spectral range from 400 to 870 nm. The absorption spectra of the excited S1 singlet states of chlorophylls a and d were recorded, and the dynamics of the of the Qy band shift of the stimulated emission (Stokes shift of fluorescence) was determined in a time range from 60 fs to 4 ps. The kinetics of the intramolecular conversion Qx→Qy (electronic transition S2→S1) was measured; the characteristic relaxation time was 54 ± 3 and 45 ± 9 fs for chlorophylls a and d, respectively.
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