Abstract
The internal conversion (IC) pathways and times between S 3 and S 1 states are investigated by simulating the fluorescence depletion spectrum (FDS) of chlorophyll-a (Chl-a) in ethyl ether solvent using the perturbative density matrix method and the transient linear susceptibility theory. The calculated internal conversion (IC) times from S 2 to S 1 states and from S 3 to S 1 states are 110 and 143 fs, respectively, and vibrational relaxation rate constant is 8.5 ps −1 for the Chl-a in ethyl ether at room temperature. The theoretical calculation shows that sequential process, S 3 → S 2 → S 1, is a main pathway for the IC process.
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